他做了一系列的实验。

He did a series of experiments.

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我们做一系列的实验。

And let's do a series of experiments.

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在一系列的实验中，作者比较了两种嫉妒。

In a series of experiments, the authors compared benign envy with its malicious cousin.

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But we know this, in particular, from a series of studies that would be unethical if they were to be done today.

我们知道这点，是通过一系列的实验，出于人道精神,这些实验现在就不能做了。

耶鲁公开课 - 心理学导论课程节选

And let's do a series of experiments.

我们做一系列的实验。

麻省理工公开课 - 热力学与动力学课程节选

He did a series of experiments.

他做了一系列的实验。

耶鲁公开课 - 心理学导论课程节选