We have had occasion to deal with members of the group on a variety of charges.

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。

He was presented with the watch on the occasion of his retirement.

他在退休时获赠这块手表。

The flight delay was occasioned by the need for a further security check.

这次航班的延误是由于必须做进一步的安全检查。

They marked the occasion (= celebrated it) with an open-air concert.

他们举办露天音乐会来庆祝这个特别的时刻。

He spent five years in Paris, with occasional visits to Italy.

他在巴黎度过了五年，偶尔去意大利看看。

I enjoy the occasional glass of wine.

我喜欢偶尔喝一杯葡萄酒。

This thing isn't occasional.

这件事不是偶然的.

He made occasional visits to London.

他有时候会去伦敦。

There may be the occasional criticism but it's clear there is no raging debate right now.

可能偶尔会有批评，但现在显然没有出现激烈的辩论。

They had an occasional coffee together after shopping.

他们偶尔会在购物后一起喝杯咖啡。