The success of their agriculture system depended upon them knowing when the river would change.

他们农业系统的成功归功于他们了解河流何时会变化。

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Anyone who has toiled through SAT will testify that test-taking skill also matters, whether it's knowing when to guess or what questions to skip.

任何一个曾经辛苦地经历过 SAT 考试的人都可以证实，应试技巧也很重要，即是否知道什么时候该猜测答案或者什么样的问题该跳过去。

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They can also be as complicated as knowing when you are "out" in a game.

它们也可能像知道你何时会在比赛中“出局”一样复杂。

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As Lincoln got on the train that would take him to Washington, he said: "I now leave, not knowing when -- or whether ever I may return.

VOA: special.2009.07.23

He struggles when he is there on the floor in their company, wanting to escape from their company, knowing that he doesn't want this.

他挣扎着，躺在地上,想逃离这些挥之不去的人群，他不想要这一切。

普林斯顿公开课 - 人性课程节选

Now, when you listen to it then, again, knowing that, you hear it that way.

当你再次听到这句话时,你便知道,你是听到的是这个

耶鲁公开课 - 心理学导论课程节选

Knowing when to harvest the agave's heart--the 50-to-80-pound mass from which juices are extracted--is an art.

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But, ultimately, death comes, and no one is good at knowing when to stop.

NEWYORKER: Letting Go

From a momentum perspective, the trick is knowing when to get off the train.

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