Decide ahead of time what you're going to do at certain times each day.

提前决定你在每天的各个特定时间段要做什么。

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Their astronomers had discovered that at a certain time of year the brightest star, Sirius, would disappear.

他们的天文学家发现，在一年中的某个时候，最亮的天狼星会消失。

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She couldn't know what time he'd go, or even for certain that he'd go at all.

她不知道他何时要走，甚至于还不能确定他究竟要不要走。

《柯林斯英汉双解大词典》

"The bus went into the middle of the desert and at a certain moment the call to prayer came just lilting through the desert - first time I've ever heard it - and then the bus stopped and all of those colorful people got off the bus."

VOA: standard.2010.05.21

For my perspective, even if you understand God to be the creator of the world, I don't think that means that God is causing a certain natural event to happen at certain time.

从我的角度来说，即使你明白,上帝是世界的创造者，但这并不意味着上帝,导致了某个自然界的现象在特定的时间发生。

普林斯顿公开课 - 人性课程节选

And they have to put in a certain amount of work time, working at the Food Co-op.

他们得抽出一部分时间去食品供销社工作。

布鲁克林的变化 - SpeakingMax英语口语达人

The simulation runs forward in time for three weeks in order to approximate the value of having a truck and driver at a certain location at a certain time, and gets a first result.

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Shareholders, unlike bondholders, receive no legal promise to be repaid in cash at a certain time.

ECONOMIST: Stocks in trade | The

You know, I made a mistake, and at a certain time, it came time to pay for it, and I paid for it.

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