PHRASE 有必要(做);需要(做) If you have occasion to do something, it is necessary for you to do it.
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。
PHRASE 偶尔;间或;有时 If something happens on occasion, it happens sometimes, but not very often.
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。
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.
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。