He treated them seriously and, on occasion, entertained them hilariously...

I'll speak to him about it if the occasion arises (= if I get a chance).

有机会的话，我要跟他谈谈这件事。

The decision occasioned us much anxiety.

这个决定让我们忧虑不堪。

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。

On one occasion, she called me in the middle of the night.

有一次她深更半夜打电话给我。

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。

on this/that occasion

这 / 那次

I've had no occasion to visit him recently.

我最近无缘去拜访他。

Her death was the occasion of mass riots.

她的逝世引发了大规模的骚乱。

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。

a great/memorable/happy occasion

伟大的 / 难忘的 / 欢乐的庆典

I'm willing to go to court over this if the occasion arises (= if it becomes necessary) .

如果必要的话，我愿意就此出庭。

He used the occasion to announce further tax cuts.

他利用这个机会宣布再次减税。

I can remember very few occasions when he had to cancel because of ill health.

我记得他因为健康不佳而被迫取消的情况绝无仅有。

Turn every meal into a special occasion .

要把每一顿饭都弄得特别一些。

It is an occasion for all the family to celebrate...

这是个值得举家庆祝的时刻。

They have been seen together on two separate occasions .

他们有两次被人看见在一起。

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。

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。

Their wedding turned out to be quite an occasion.

他们的婚礼办得相当隆重。

He has been known on occasion to lose his temper.

大家都知道他有时会发脾气。