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N-COUNT
球
A ball is a round object that is used in games such as tennis, baseball, football, basketball, and cricket.
例句
...a golf ball.
高尔夫球
...a tennis ball.
网球
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N-COUNT
球状物
A ball is something or an amount of something that has a round shape.
例句
Thomas screwed the letter up into a ball...
托马斯把信揉成一团。
They heard a loud explosion and saw a ball of fire go up.
他们听见一声爆炸的巨响，看见一个火球腾空而起。
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V-ERG
（使）成球状（或团块）
When you ball something or when it balls, it becomes round.
例句
He picked up the sheets of paper, and balled them tightly in his fists...
他抓起那几张纸，在手里紧紧攥成团。
His hands balled into fists...
他攥起了拳头。
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N-COUNT
（脚趾和脚相连或拇指和手相连的）球状部位；脚趾球；拇指球
The ball of your foot or the ball of your thumb is the rounded part where your toes join your foot or where your thumb joins your hand.
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N-COUNT
舞会
A ball is a large formal social event at which people dance.
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N-COUNT
睾丸
A man's balls are his testicles.
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PHRASE
轮到…采取行动（或作出决断）
If you say that the ball is in someone's court, you mean that it is his or her responsibility to take the next action or decision in a situation.
例句
The ball's now in your court — you have to decide what you're going to do.
轮到你了——你必须决定自己要做什么。
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PHRASE
使某事发生；开始某种活动
If you get the ball rolling ,set the ball rolling, or start the ball rolling, you start something happening.
例句
He will go to the Middle East next week to get the ball rolling again on peace talks...
他下周将前往中东，开始重启和谈。
I just want enough cash to start the ball rolling.
我只是想有足够的启动资金。
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PHRASE
玩得很开心；尽情欢乐
If you are having a ball, you are having a very enjoyable time.
例句
Outside the boys were sitting on the ground and, going by the gales of laughter, they were having a ball.
男孩们在户外席地而坐，从阵阵笑声来看，他们玩得很开心。
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PHRASE
同时做数件事情
If you keep several balls in the air, you try to do several different things at once.
例句
The detective has to discover the motive, the means and the opportunity and has to keep these three balls in the air.
那名侦探必须查明动机、手段和时机，而且对这三项的调查必须同步展开。
...unhappy mothers trying to juggle ten balls in the air.
同时要做无数件事情的可怜的母亲
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PHRASE
警觉；机警；留心
If someone is on the ball, they are very alert and aware of what is happening.
例句
She really is on the ball; she's bought houses at auctions so she knows what she's doing.
她很精明干练；她通过拍卖购过房，所以知道自己在做什么。
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PHRASE
愿意合作
If someone refuses to play ball, they are unwilling to do what someone wants them to do.
例句
The association has threatened to withdraw its support if the banks and building societies refuse to play ball.
该协会威胁说如果银行和建屋互助会不配合的话，它将不再提供支持。