同义词
反义词
  • once的反义词之:
    again
词组
  • all at once
    without warning; suddenly 突然 all at the same time 同时
  • for once (或this once)
    on this occasion only, as an exception 就(这)一次;破例一回
  • once a ——, always a ——
    (proverb)a person cannot change their fundamental nature (谚)一次…始终…
  • once again (或more)
    one more time 又一次,再一次
  • once and for all (或once for all)
    now and for the last time; finally 一劳永逸;彻底地
  • once and future
    denoting someone or something that is eternal, enduring, or constant 永久的;持久的;持续的
  • once bitten, twice shy
  • once (或every once) in a while
    from time to time; occasionally 偶然;间或
  • once or twice
    a few times 一两次
  • once upon a time
    at some time in the past (used as a conventional opening of a story) 从前(用于故事的开头)
  • at once
    All at one time; simultaneously 立刻;同时 Immediately; instantly 立即;马上
英语四级真题
  • Where are you in the cycle of renewal: Are you actively preserving the present, or selectively forgetting the past, or boldly creating the future? What advice would Leah give you to move you ahead on your journey? Once we're on the path of growth, we can continually move through the seasons of transformation and renewal.
    出自-2017年6月阅读原文
  • The late Richard Hackman of Harvard University once argued, I have no question that when you have a team, the possibility exists that it will generate magic, producing something extraordinary… But don't count on it.
    出自-2017年6月阅读原文
  • What people were like when they came in had greater consequence than what happened once they were there.
    出自-2016年6月阅读原文
  • Trigger its built-in alarm system at once.
    出自-2016年6月阅读原文
  • She has once run a pre-K program.
    出自-2016年6月阅读原文
  • Once driverless cars are actually for sale, the early adopters will be the people who can afford to buy them.
    出自-2016年6月阅读原文
  • Wireless devices will transmit signals so as to activate the alarm once something wrong is detected.
    出自-2016年12月阅读原文
  • Sugar, alcohol and tobacco, economist Adam Smith once wrote, are commodities which are nowhere necessaries of life, which have become objects of almost universal consumption, and which are, therefore, extremely popular subjects of taxation.
    出自-2016年12月阅读原文
  • So, too, would the motion detectors in your home, so the thief will need to continue jamming once he's inside and searching for things to steal.
    出自-2016年12月阅读原文
  • This once-in-alifetime  event actually may take  place twice in some folks’ lives.
    出自-2016年12月听力原文
  • When Jonathan Swift proposed, in 1729, that the people of Ireland eat their children, he insisted it would solve three problems at once: feed the hungry masses, reduce the population during a severe depression, and stimulate the restaurant business.
    出自-2015年12月阅读原文
  • Once you have worthy opponents, set some ground rules so everyone understands responsibilities and boundaries.
    出自-2015年12月阅读原文
  • Once the essay was flawless, she would take an evening to walk me through my errors.
    出自-2015年12月阅读原文
  • Nearly two-thirds of us grab fast food once a week, and we get almost 25% of our daily calories from snacks.
    出自-2015年12月阅读原文
  • Franz Kafka once said: Writing is utter solitude ( ' , 独处 ), the descent into the cold abyss ( ' , 深渊 ) of oneself.
    出自-2015年12月阅读原文
  • Once, just after I returned from my year in Vienna, I was asked to translate for a German judge at an Olympiclevel horse event.
    出自-2015年12月听力原文
  • Once across, the ropes were tied down and wooden bridges were hung from them.
    出自-2015年12月听力原文
  • He had a terrible temper, and once threatened to kill another child.
    出自-2015年12月听力原文
  • they are not reused once a new edition comes out
    出自-2013年6月阅读原文
  • All computers do is fetch and work with numbers, he once explained, but do it fast enough and "the results appear to be magic".
    出自-2012年12月阅读原文
  • And most noticeable of all, there is the phenomenon of large urban and suburban high schools that have split up into smaller units of a few hundred, generally housed in the same grounds that once boasted thousands of students all marching to the same band.
    出自-2012年6月阅读原文
  • I say you only live once and we work hard and what's the point if you can't go on holiday.
    出自-2011年12月阅读原文
  • We can get a lot of our ingredients once a week from the UK," Tamlyn explains.
    出自-2011年6月阅读原文
  • Tamlyn says that besides importing ingredients from Britain once a week, his restaurant also buys vegetables from the local markets
    出自-2011年6月阅读原文
  • it takes a long time to restore nature once damaged
    出自-2010年12月阅读原文
  • Once she lost a two-cent stamp and spent the night looking for it.
    出自-2014年6月听力原文
  • Get key information by reading just once or twice
    出自-2014年6月听力原文
  • Why did Donna go back to Brazil once again?
    出自-2013年12月听力原文
  • Finally, on June 7, McLaughlin once again demonstrated his carelessness by knocking down several mailboxes near the edge of the company's parking lot
    出自-2013年12月听力原文
  • But it's no longer what it once was in the region.
    出自-2012年6月听力原文
  • So some of the values they teach may not be as important in the culture as they once were.
    出自-2011年12月听力原文
  • It cannot be fully restored once damaged.
    出自-2011年6月听力原文
  • "For once, we are the ones who are blocking the traffic," he says delightedly.
    2018年6月四级真题(第二套)阅读 Section B
  • An individual's genetics has a big influence on their height but once you average over whole populations, genetics plays a less key role.
    2019年6月四级真题(第二套)阅读 Section C
  • And here's one more: We went on a campaign trip once in Italy, and my wife spent the whole time worrying about bats getting into her hair.
    2017年6月四级真题(第二套)听力 Section B
  • Experimental users may try drugs once or twice.
    2015年12月四级真题(第二套)听力 Section C
  • Franz Kafka once said: "Writing is utter solitude , the descent into the cold abyss of oneself."
    2015年12月四级真题(第二套)阅读 Section B
  • I met a woman once, an Italian.
    2016年12月四级真题(第一套)听力 Section B
  • In Japan, once when I was in the studio audience of a TV cooking show, I was asked to go up on the stage and taste the beef dish that was being prepared and tell what I thought.
    2015年12月四级真题(第一套)听力 Section C
  • Large mammals once wandered the volcano's slopes, but today, foxes, wild cats, rabbits and mice are more common.
    2019年6月四级真题(第二套)听力 Section C
  • Once the essay was "flawless," she would take an evening to walk me through my errors.
    2015年12月四级真题(第二套)阅读 Section B
  • Once we're on the path of growth, we can continually move through the seasons of transformation and renewal.
    2017年6月四级真题(第二套)阅读 Section B
  • Once you are done demonstrating whatever concept was in the textbook, you throw away the pipe cleaners, the straws, the cardboard tubes.
    2019年6月四级真题(第三套)阅读 Section B
  • Once you get beyond the initial learning curve, knitting and crocheting can lower heart rate and blood pressure.
    2017年12月四级真题(第三套)阅读 Section B
  • Once you have worthy opponents, set some ground rules so everyone understands responsibilities and boundaries.
    2015年12月四级真题(第二套)阅读 Section C
  • Once, just after I returned from my year in Vienna, I was asked to translate for a German judge at an Olympic level horse event.
    2015年12月四级真题(第一套)听力 Section C
  • She suggested that the brain can process just so much at once, and that activities like knitting and crocheting make it harder for the brain to register pain signals.
    2017年12月四级真题(第三套)阅读 Section B
  • They have been huge supporters of the district's advanced mathematics program, which once began in the fourth grade but will now start in the sixth.
    2018年6月四级真题(第一套)阅读 Section B
  • Thomas Edison, the famous inventor, once said "I've not failed."
    2019年12月四级真题(第一套)听力 Section B
  • When they interact, they aren't afraid to smell each other and will express themselves clearly and honestly. Once again, it seems we have a lot to learn from dogs.
    2019年12月四级真题(第二套)听力 Section C
英语六级真题
  • The British traveler Charles Thompson spoke for many Grand Tourists when in 1744 he described himself as being impatiently desirous of viewing a country so famous in history, a country which once gave laws to the world, and which is at present the greatest school of music and painting, contains the noblest productions of sculpture and architecture, and is filled with cabinets of rarities, and collections of all kinds of historical relics.
    出自-2017年6月阅读原文
  • The elevation of the room that once belonged only to the servants to that of design showcase for the modem family tells the story of a century of social change.
    出自-2016年6月阅读原文
  • That falls far short of the billions of dollars people once expected it to generate.
    出自-2016年6月阅读原文
  • Parents are concerned that their children may get involved in criminal offences once they reach their teens.
    出自-2016年6月阅读原文
  • No wonder parents worry their own kids might spin out of control once they hit the turbulent waters of adolescence.
    出自-2016年6月阅读原文
  • It had, apparently, been fished out of existence; and the once mighty Newfoundland fleet now gropes about frantically for crab on the sea floor.
    出自-2016年6月阅读原文
  • About once a week, I have a client that will bring up a new certification I've never even heard of and I'm in this industry, said Kevin Wilhelm, chief executive officer of Sustainable Business Consulting.
    出自-2016年6月阅读原文
  • Putting in effect the policies in the agreement at once.
    出自-2016年12月阅读原文
  • Perlow calls this vicious cycle the cycle of responsiveness: Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.
    出自-2016年12月阅读原文
  • Consumers are becoming increasingly bored with what companies have to offer: A survey of 28,000 consumers in 28 countries released by Accenture found consumers are not as excited about technology as they once were.
    出自-2016年12月阅读原文
  • Stacy is going to walk you through the step-by-step process of becoming a social worker and Mill will tell you about the range of options you have once you get your social work degree, as well as the high standards of responsibility the social workers must adhere to.
    出自-2016年12月听力原文
  • that is, once you build it up, it has to go somewhere.
    出自-2015年12月阅读原文
  • Unfortunately for them ( ' , and often the taxpayers), our energy systems are a bit like an aircraft carrier: they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia ( ' , meaning it takes a lot of energy to set them moving), and they have a lot of momentum once they are set in motion.
    出自-2015年12月阅读原文
  • So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once be is moving, it is hard to change his state of motion.
    出自-2015年12月阅读原文
  • Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.
    出自-2015年12月阅读原文
  • Now, she attributes much of her understanding of college to that: But once I got to campus, it was a completely different ball game that no one really prepared me for.
    出自-2015年12月阅读原文
  • By sanctioning this watered-down version of college, universities are catering to the social and educational needs of wealthy students at the expense of others who won't enjoy the financial backing or social connections of richer students once they graduate.
    出自-2015年12月阅读原文
  • "About once a week, I have a client that will bring up a new certification I've never even heard of and I'm in this industry," said Kevin wilhelm, chief executive officer of Sustainable Business Consulting.
    2016年6月六级真题(第一套)阅读 Section C
  • "Once we scale up, algorithms must be sensitive to tiny changes in identities and at the same time invariant to lighting, pose, age," Kemelmacher-Shlizerman said.
    2018年6月六级真题(第一套)阅读 Section C
  • As marketing professors Silvia Bellezza, Neeru Paharia, and Anat Keinan recently explained in Hazard Business Review HBR, leisure time was once seen as an indicator of high social status, something attainable only for those at the top.
    2017年12月六级真题(第三套)阅读 Section C
  • But once that money is gone, he says he doesn't know what he'll do.
    2016年6月六级真题(第一套)听力 Section C
  • But once these plants use up their stored reserve or tap out the underground supply, they cease growing and start to die.
    2018年6月六级真题(第一套)阅读 Section B
  • By sanctioning this watered-down version of college, universities are "catering to the social and educational needs of wealthy students at the expense of others " who won't enjoy the financial backing or social connections of richer students once they gra
    2015年12月六级真题(第一套)阅读 Section C
  • Consumers are becoming increasingly bored with what companies have to offer: A survey of 28,000 consumers in 28 countries released by Accenture found consumers are not as excited about technology as they once were.
    2016年12月六级真题(第二套)阅读 Section B
  • Driving once seemed to be a very human skill.
    2019年6月六级真题(第三套)阅读 Section C
  • Each featuring a different researcher, one of whom they'd met once two years earlier.
    2019年12月六级真题(第一套)听力 Section C
  • first, keeping up with the pace of technological change; recruiting high-quality staff in a time of skills shortages in it as a whole and in a highly competitive market; and the issue of retaining staff once they've been recruited and trained.
    2016年12月六级真题(第二套)听力 Section C
  • Here, the brightly colored scenes that once decorated a mansion are being dug up.
    2019年6月六级真题(第二套)听力 Section B
  • If an adverse reaction to a drug is serious, consult your doctor for advice at once.
    2017年12月六级真题(第二套)听力 Section C
  • Momentum is said to be "conserved", that is, once you build it up, it has to go somewhere.
    2015年12月六级真题(第一套)阅读 Section B
  • Native plants are coming back, and the fox once again bound about carefree.
    2018年12月六级真题(第三套)阅读 Section A
  • Now, she attributes much of her understanding of college to that: "But once I got to campus, it was a completely different ball game that no one really prepared me for."
    2015年12月六级真题(第三套)阅读 Section B
  • Once armed with a method for gaining access to iPhones, the government could ask to use it proactively, before a suspected terrorist attack—leaving Apple in a bind as to whether to comply or risk an attack and suffer a public-relations nightmare.
    2017年12月六级真题(第三套)阅读 Section B
  • Once every three or four years, when conditions are right, the lake is covered with the pink birds as they stop flight to breed.
    2017年12月六级真题(第三套)阅读 Section C
  • Once Farrant and her colleagues feel they have a better sense of which switches to throw, they will have to find the best way to do so in useful crops.
    2018年6月六级真题(第一套)阅读 Section B
  • Once one person looks at their phone, other people feel compelled to do the same, starting a chain reaction.
    2017年12月六级真题(第一套)阅读 Section B
  • Once purchased and trained, this would allow the casual user to save money and time, freeing up precious space in our busy lives to read a good book.
    2018年6月六级真题(第三套)阅读 Section A
  • Once the data and associated materials appear in a repository answering questions and handling complaints can take many hours.
    2017年12月六级真题(第二套)阅读 Section B
  • Once the final charts and tables are ready, I have to check them and organize a presentation.
    2016年6月六级真题(第二套)听力 Section A
  • Once the interviewers have been briefed, I send the client a schedule and then they get back to me with deadlines.
    2016年6月六级真题(第二套)听力 Section A
  • Once upon a time, Americans thought that if they work hard enough even in the face of adversity, they would be rewarded with success.
    2018年12月六级真题(第一套)听力 Section C
  • Once we recognize that these things happen to us, we are half way to doing something about them.
    2019年6月六级真题(第一套)听力 Section B
  • Once you get out of there, you become that part, only you're using music instead of dialogue.
    2015年12月六级真题(第一套)听力 Section A
  • Online security cameras, intelligent lighting and a wealth of sensors that control both temperature and air quality are offering an unprecedented level of control, efficiency, and improvements to what were once classed necessary costs when running a busin
    2017年12月六级真题(第二套)阅读 Section C
  • Perlow calls this vicious cycle the "cycle of responsiveness": Once bosses and colleagues experience an employee's increased responsiveness, they increase their demands on the employee's time.
    2016年12月六级真题(第一套)阅读 Section B
  • Photography was once an expensive, laborious ordeal reserved for life's greatest milestones.
    2018年6月六级真题(第二套)阅读 Section C
  • piaget argued that once adolescents enter the world of work, their newly acquired ability to form hypotheses allows them to create representations that are too ideal.
    2016年6月六级真题(第三套)阅读 Section A
  • So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once he is moving, it is hard to change his state of motion.
    2015年12月六级真题(第一套)阅读 Section B
  • Stacy is going to walk you through the step-by-step process of becoming a social worker and mill will tell you about the range of options you have once you get your social work degree, as well as the high standards of responsibility the social workers mus
    2016年12月六级真题(第一套)听力 Section C
  • The best seek to alleviate the external pressures on their pupils while equipping them better to understand and handle the world outside一 at once sheltering them and broadening their horizons.
    2019年12月六级真题(第三套)阅读 Section C
  • The elevation of the room that once belonged only to the servants to that of design showcase for the modern family tells the story of a century of social change.
    2016年6月六级真题(第二套)阅读 Section C
  • The extreme isolation of these massive farms leaves them often unattended, and monitored only once or twice a year, which means if the livestock falls ill or requires assistance, it can be a long time for farmers to discover.
    2018年12月六级真题(第三套)阅读 Section C
  • The order essentially asks Apple to hack its own devices, and once it is in place, the precedent could be used to justify law enforcement efforts to get around encryption technologies in other investigations far removed from national security threats.
    2017年12月六级真题(第三套)阅读 Section B
  • The Tanzanian government has once again started mining the lake for soda ash, used for making chemicals, glass and detergents.
    2017年12月六级真题(第三套)阅读 Section C
  • They help us take in more information, hold several ideas in mind at once and understand how different ideas relate to each other.
    2016年12月六级真题(第二套)听力 Section C
  • They typically appear about once in a decade.
    2018年12月六级真题(第二套)听力 Section B
  • Unfortunately for them and often the taxpayers, our energy systems are a bit like an aircraft carrier : they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia meaning it takes a lot of energy to se
    2015年12月六级真题(第一套)阅读 Section B
  • When I re-entered the full-time workforce a few years ago after a decade of solitary self-employment, there was one thing I was looking forward to the most: the opportunity to have work friends once again.
    2019年6月六级真题(第三套)阅读 Section C
  • Yet once they start growing, such plants seem not to retain the ability to hit the pause button on metabolism in their stems or leaves.
    2018年6月六级真题(第一套)阅读 Section B
  • You may have heard that Coca-Cola once contained an ingredient capable of sparking particular devotion in consumers: cocaine.
    2017年12月六级真题(第一套)阅读 Section C
柯林斯高阶英汉双解学习词典释义
英汉词典释义
英英词典释义
  • Adjective
    1. belonging to some prior time;
    "erstwhile friend""our former glory""the once capital of the state""her quondam lover"
  • Adverb
    1. on one occasion;
    "once I ran into her"
    2. as soon as;
    "once we are home, we can rest"
    3. at a previous time;
    "once he loved her""her erstwhile writing"
行业词典
  • 土木工程: 直流冷却水系统;once-through cooling water system;直流水系统;once-through water system;
    电力: 抛弃法烟气脱硫;once-through FGD process;直流锅炉;once-through boiler;