Animals can be conditioned to expect food at certain time.

可以训练动物定时等待食物。

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Results: The titer of special antibody and the immune organ indices of experimental groups were higher than that of the control, and the difference was significant at certain time points.

结果试验组特异性免疫抗体和免疫器官指数均高于对照组，在某些时间点差异显著。

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"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

Each year it's dramatized by the cycle of the seasons, And at a certain time of the year it seems that The forces of darkness and chaos are prevailing but each spring, Once again, cosmic order and life return.

每年这冲突都由季节的轮回戏剧性地体现出来，仿佛是每年都有一个时期,弥散着黑暗和混乱的势力，可是每当春天来临，宇庙的秩序又恢复了。

耶鲁公开课 - 旧约导论课程节选

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.

FORBES: Magazine Article

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.

FORBES: Forget Oprah: James Frey Talks Truth With Big Think