The table folds up when not in use.

这桌子不用时可以折叠起来。

《牛津词典》

The language and style you use when making an oral presentation should not be the same as the language in style you use when writing.

你在做口头报告时使用的语言和风格不应该与你在书面写作时使用的语言和风格相同。

youdao

The language and style you use when making an oral presentation should not be the same as the language and style you use when writing.

你在做口头报告时使用的语言和风格与你书写时用的不同。

youdao

She and her best friend still use it, especially when they do not want their children to know what they are talking about.

VOA: special.2009.12.04

They like to--when they're computing the investment yield, they want to be completely honest and not use any rules of thumb.

当他们计算投资收益率的时候,他们需要完全精确,而非用经验公式

耶鲁公开课 - 金融市场课程节选

And you want to use it when you really, really do not like something

当你特别特别厌恶某事的时候，你才会用这个词。

I hate 课堂 - SpeakingMax英语口语达人

In humans, microsatellite analysis works well for individuals, but is not much use when it comes to looking at entire populations.

ECONOMIST: Genetics

When the iPads are not in use or when the "iBusiness" is parked they can be stored securely and hidden from sight in custom-tailored compartments in the BRABUS center console.

ENGADGET: Brabus iBusiness luxury sedan puts an iPad at every seat, a Magic Mouse at every hide-covered armrest

First, to have the technology and not use it is when available is wasteful.

FORBES: Baseball's Unwillingness to Expand Instant Replay is Bad Business