TIME 时间

SPECIAL EVENT 特别的事件, [C] an important social event or ceremony

重要的社交活动，盛会:

I'm saving this bottle of champagne for a special occasion .

我要把这瓶香槟酒留到特殊场合用。

They presented him with a gift to mark the occasion (=celebrate it) .

他们赠给他一件礼物来庆贺这一特别的时刻。

His funeral was a great occasion of public mourning.

他的葬礼是一次给大众追思的重要时刻。

CAUSE / REASON 原因, [U] [formal] a cause or reason

直接的原因，诱因:

His remark was the occasion of a bitter quarrel.

他的话引起了一场激烈的争吵。

I had occasion to call on him last year.

去年我有事去探望过他。

if (the) occasion arises, [formal] if a particular action ever becomes necessary

如有必要，必要时:

If ever the occasion arises when I want advice, you're the first person I'll come to.

如果我需要建议的话，我第一个就来找你。

on occasion, sometimes but not often

有时，间或，偶尔:

On occasion prisoners were allowed visits from their families.

有时候囚犯的家属可获准去探望他们。

on the occasion of sth, [formal] at the time of an important event

在〔重要事件〕之际:

on the occasion of his second wedding

在他第二次婚礼上

to cause something

引起，惹起:

She had a long career break occasioned by her husband's job being moved to Paris.

他丈夫转到巴黎去工作，因此她的职业生涯中断了很长一段时间。

Your behaviour has occasioned us a great deal of anxiety.

你的行为让我们极为不安。