A closed system would be, for instance, a glass of ice water with an ice cube in it, with the lid on top.

一个封闭系统可以是，比如说，一杯放了一个冰块的冰水，顶上加了盖子。

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It's a closed system.

这是一个封闭的系统。

youdao

Its very attraction was that it was a closed system.

它的亮点在于这事一个封闭系统。

youdao

The process uses a closed system to keep hair and dirt out of the milk.

VOA: special.2010.07.20

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

We don't say anything about implicitly here, we're talking about a closed system, so there's no mass leaving the system.

我们不讨论,这是隐含条件，因为我们讨论的是孤立系统，因此系统没有物质流失。

麻省理工公开课 - 热力学与动力学课程节选

But the catch with alternative instant messaging services is that each one is a closed system.

CNN: One-third of Americans prefer texts to voice calls

Company security officials said Facebook is a closed system, which can be helpful in erasing phony messages from all accounts.

CNN: Facebook, Twitter crooks just a click away

Apple has chosen a closed system in which it and only it derives nearly all the economic benefit of its technology.

FORBES: Consumers Would Like To See Samsung And Apple Reconcile