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When we consider the nightly lifestyle of these bats, we will see they have to be sensitive to the changing light levels because this is how they sense when to start hunting.

当我们考虑这些蝙蝠的夜间生活方式时，我们会发现，它们必须对不断变化的光线水平保持敏感，因为这是它们感知何时开始狩猎的方式。

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How do participants know when to start?

参与者如何知道工作何时开始？

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A high burden of infectious diseases. Lack of provision of family planning allowing a women to decide when to start and end having children and how to space her children.

VOA: special.2009.10.19

We'll come back to them a little bit later when we start talking about the question, "Could machines be creative?"

稍后再对其继续讨论,当我们开始探讨这样一个问题,机器有创造能力吗

耶鲁公开课 - 死亡课程节选

What would you say is the most important quality when you're trying to start your own business?

当你尝试创业的时候，你觉得什么品质是最重要的呢？

要想成为事业家 - SpeakingMax英语口语达人

And it told you when to start compiling your records or at least worrying about them.

FORBES: Hey IRS, Where's My Tax Package?

What criteria would you use to determine when to start bringing U.S. troops home from Iraq?

NPR: Transcript of Presidential Debate

Debate has heated up among Fed policymakers about when to start curtailing the bond-buying program, which began last fall.

WSJ: Fed survey: Housing and auto sales lift US economy