The system can be an open system, or it can be a closed system, or it can be isolated.

系统可以是开系，可以是闭系，或是孤立系。

麻省理工公开课 - 热力学与动力学课程节选

In San Francisco, it's something you can pretty much be open about.

在某些方面，旧金山真的是很开放。

有各种社区 - SpeakingMax英语口语达人

Now you can actually go, now that I realize that Libya is now open; it's no longer a closed territory.

现在你确实可以去那个地方,据我所知,现在利比亚已经对外开放,不再是一个封闭国家

耶鲁公开课 - 古希腊历史简介课程节选

But I'll give you the envelope and you can open it up and read them.

但我会把信封给你,你可以打开信封自己看。

耶鲁公开课 - 死亡课程节选

It can be challenged on normal... Yeah, open to challenge. -Right.

一般情况下人们可以挑战。,对，人们可以挑战其中的观点，-是的。

普林斯顿公开课 - 人性课程节选

A state where it's closed, so imagine a channel with a lid on top of it; when it's closed nothing can go through the channel, when it's open then things can go through.

一种是闭合状态,想想一个有盖子的通道吧,当盖子合上的时候任何东西都不能通过,而打开时就畅通无阻

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