The thermos, with the lid on top, It's not a open system your coffee is going to stay warm or hot in the thermos.
顶部盖了盖子的热水瓶,不是开系,你希望你的咖啡在热水瓶里面保持温暖,或滚烫。
The Earth seems to be a pretty good inertial system, because on the ground, you leave something, it stays there.
地球看上去是个不错的惯性系,因为什么东西放在地上,都会保持静止
The number of moles stays the same a closed systems, gas doesn't come out.
摩尔数保持不变,因为是闭系,气体不会跑出去。
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