The city has more than 10,000 closed circuit security cameras, including in the transportation system.
VOA: standard.2010.04.01
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。
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。
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。
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。
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。
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。
And that's the closed system.
这就是闭系。
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