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An open system, as the name describes, allows mass and energy to freely flow through the boundary.
开系，顾名思义，允许质量和能量自由地,流过它的边界。
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But they have really had a big scaling down of the mass transit system this year.
但是今年确实大幅度削减了公共交通。
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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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He goes back and redoes the calculation, only in this case he says what I am going to do is I am going to redo the calculation for helium, but I am going to consider not just the mass of the electron but the reduced mass of the system.
他回去重新做了计算，仅在这种情况下他才会说说我将要,为氦重做计算，但我认为,不只是电子的质量,还有系统质量的减少量。
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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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You just need a few macroscopic variables that are very familiar to you, like the pressure, the temperature, the volume, the number of moles of each component, the mass of the system.
你只需要某些你非常熟悉的宏观变量,比如压强，温度，体积，每个组分的摩尔数，系统的质量。
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Mass and energy -- I'm an open system, right?
质量和能量--我是个开系，对吧？
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system is the opposite of the open system, no mass and no energy can flow through the boundary.
孤立系与开系正相反，没有质量或能量,能流过它的边界。
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