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The city has more than 10,000 closed circuit security cameras, including in the transportation system.
VOA: standard.2010.04.01
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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。
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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。
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It's insulated. It's a closed system. In fact, it's an isolated system. There's no energy or matter that can go through that boundary.
系统指的，是盒子里的东西,它是封闭孤立的。
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The closed system allows energy to transfer through the boundary but not mass.
闭系允许能量通过它的边界传递,但质量不行。
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So a closed system would be, for instance, a glass of ice water with an ice cube in it, with the lid on top.
因此闭系可以是，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, so the number moles doesn't change.
这是一个封闭系统，因此摩尔量不会改变。
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And that's the closed system.
这就是闭系。
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