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N-COUNT
时刻；时候；时节；场合
An occasion is a time when something happens, or a case of it happening.
例句
I often think fondly of an occasion some years ago at Covent Garden...
我时常愉快地回想起几年前在科文特花园的一个时刻。
Mr Davis has been asked on a number of occasions.
戴维斯先生曾多次被问及。
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N-COUNT
重大活动；仪式；庆典
An occasion is an important event, ceremony, or celebration.
例句
Taking her with me on official occasions has been a challenge...
带着她出席正式场合对我来说一直是个挑战。
It will be a unique family occasion.
这将是一次特别的家庭聚会。
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N-COUNT
机会；时机
An occasion for doing something is an opportunity for doing it.
例句
It is an occasion for all the family to celebrate...
这是个值得举家庆祝的时刻。
It is always an important occasion for setting out government policy.
这历来都是阐明政府政策的重要时机。
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VERB
导致；引起；使发生
To occasion something means to cause it.
例句
He argued that the release of hostages should not occasion a change in policy.
他认为释放人质不应造成政策的改变。
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PHRASE
有必要（做）；需要（做）
If you have occasion to do something, it is necessary for you to do it.
例句
We have had occasion to deal with members of the group on a variety of charges.
我们有必要以多项罪名起诉该组织的成员。
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PHRASE
偶尔；间或；有时
If something happens on occasion, it happens sometimes, but not very often.
例句
He treated them seriously and, on occasion, entertained them hilariously...
他对待他们严肃认真，偶尔又逗得他们捧腹不已。
He translated not only from the French but also, on occasion, from the Polish.
他不仅做法文翻译，有时也做些波兰语翻译。
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PHRASE
成功应付困难局面；关键时刻发挥作用
If you say that someone rose to the occasion, you mean that they did what was necessary to successfully overcome a difficult situation.
例句
Inverness, however, rose to the occasion in the second half, producing some of the best football they have played for some time.
然而，因弗内斯队在下半场经受住了考验，踢出了很长一段时间以来的最佳水平。