仅当需要的时候才刷新数据。

Flushing the data is only performed when needed.

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透明性，像阳光，当需要的时候可以被仔细的看到。

Transparency, like sunlight, needs to be looked at carefully.

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当需要的时候，要学会做该做的事，不管你是否喜欢。

Learn to do what ought to be done when it should be done, whether you like it or not.

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You'll find Eve in Book Nine of Paradise Lost voicing essentially this same sentiment when she's explaining to Adam why she needs to work separately.

你会在失乐园第十部看到夏娃说出了实际上是,同样的意见，当她向亚当解释,她需要和他分开工作的时候。

耶鲁公开课 - 弥尔顿课程节选

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 what that means it's there's all sorts of precautions and procedures you take that are special when you deal with these.

这意味着当你与它们打交道的时候,你需要做各种各样特别的防范措施与流程。

麻省理工公开课 - 化学原理课程节选