Some possible ideas are to teach Closed Change Steps with the Men and Ladies all moving forward down the room, then all moving back.

可能的做法有：教授并换步，男士和女士都一致向前或向后做并换步。

youdao

You can no more change events in your past in a space-time with closed timelike curves than you can change events that already happened in ordinary space-time, with no closed timelike curves.

对发生在过去的一个封闭的时间型曲线时空里的事，你不可能改变。这就类似于说，在没有封闭的时间型曲线的平常时空中，你能改变已经发生的事。

youdao

During our tests the perspective didn't change and no files were opened or closed.

在我们测试的过程中，视图并没有改变，并且没有打开或者关闭任何文件。

youdao

It's a closed system, so the number moles doesn't change.

这是一个封闭系统，因此摩尔量不会改变。

麻省理工公开课 - 热力学与动力学课程节选

Once inside, keep your windows closed, change your air filters, and run your air conditioner, Dr. Kao adds.

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The Senate begins its deliberations Tuesday behind closed doors, unless senators change the rules.

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That means hiring and involving the right people, communicating the change and installing closed-loop systems and processes to track it closely.

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