Adverb:

1. now and then or here and there;

   "he was arrogant and occasionally callous"
   "open areas are only occasionally interrupted by clumps of trees"
   "they visit New York on occasion"
   "now and again she would take her favorite book from the shelf and read to us"
   "as we drove along, the beautiful scenery now and then attracted his attention"
   

1. 间或,有时：giveoccasion to 引起 . |onoccasion 间或,有时 . | occur to 被想到 .

2. 不时地;必要时：on the fire 在考虑中 |onoccasion 不时地;必要时 |on theoccasion 在那时

3. 偶尔：on the increase 正增长 |onoccasion 偶尔 |on second thought 仔细考虑

He worked on his book by fits and starts.

他偶尔写一写他的书。

He looks in on us once in a while.

他偶尔顺便来看看我们。

Heat sometimes causes a prickly rash on the skin.

热有时使皮肤上生剌痛的疹子。

It is, however, necessary on occasion to work outwith these hours.

然而，有时候在这些时点之外也需要工作。

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。

Nobody is perfect, and everyone acts thoughtlessly on occasion.

人无完人，谁都难保不偶尔疏忽一次。

Everyone should indulge in fantasy on occasion.

每个人都应偶尔沉浸在想像之中.

You have on occasion surprised people.

你有时使人们感到诧异.

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。

He was gifted, on occasion, with a gentle raillery, which almost always concealed a serious meaning.

他一有机会, 总爱说一些温和的讥诮言词, 但几乎每次都含着严正的意义.

on occasion he went to London to spend the weekend.

有时他去伦敦渡周末.

Swift had been as plain and as satirical, on occasion.

斯威夫特的文笔有时同样朴实,同样喜欢讽刺.

In fact the adjective is becoming a real necessity on occasion.

事实上,这个形容词有时确实是必不可少的.

He visits the city on occasion.

他偶尔访问这座城市.

She visits the city on occasion.

她有时到城里去.

He forgot to do homework on occasion.

有时他忘了做家庭作业.

on occasion, convulsions may be associated with HC.

偶而,猪瘟可伴发痉挛.

( By this time, Mr. Lorry dared to be pleasant with her, on occasion. )

( 这时罗瑞先生已经敢于偶然跟她开开玩笑了 )