Casey worked for him upon occasion.

凯西不时会为他工作。

I'm very fortunate to, upon occasion, to get away from the confines of the house.

我很幸运，有时可以离开庄园出去溜达。

And... and so, I would misbehave upon occasion, out of pure boredom.

而且… … 所以，我有时会出于纯粹的无聊而行为不端。

It is not a thing to be used indiscriminately, but it is good upon occasion: as now, for instance.

它不是随便使用的东西，但在某些场合使用它是好的：例如现在。

For himself he only wanted a useful hack, which would draw upon occasion; being about to marry and to give up hunting.

对于他自己， 他只想要一个有用的黑客， 以备不时之需。 即将结婚并放弃狩猎。

The fact that she was a woman frequently worked in her favor, for she could upon occasion look so helpless and appealing that she melted hearts.

事实上正因为她是女流之辈，事情反而对她有利，因为有时她装出一副毫无办法和恳求的样子，人们一看心就软了。

I had formerly, upon occasion, discoursed with my master upon the nature of government in general, and particularly of our own excellent constitution, deservedly the wonder and envy of the whole world.

以前，我曾偶尔与我的主人讨论过一般政府的性质，特别是我们自己出色的宪法，当之无愧地让全世界惊叹和羡慕。