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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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Mass and energy flow through boundary.
质量和能量流过边界“
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And I have purposely made the arrow shorter to indicate that it has been slowed because we are going to argue its mass didn't change, so the only way to change its energy is to change its velocity.
我已经故意将这个箭头弄短,用来象征它变慢了,因为我们将证明它的质量没有变，只有它的能量改变了,也就是它的速度变了。
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It's a particle of mass m and momentum p has this energy so you solve for the energy, you get two answers.
一个质量为m,动量为p的粒子,有这么大的能量,你解出能量,得到两个解
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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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So, if you could make automobiles with a high magnesium content, you would reduce the mass, reduce the energy required, and thereby reduce the environmental impact.
所以，如果你能用含镁量,很高的材料来制造手机，你就能减轻手机的质量，减少制造所需能量，因此减轻了对环境的破坏。
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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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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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