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And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.
在实际中，我们定义,效率为热与功的比值。
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It's just minus the sum of all these things, because of course these are just defined as the work done by the environment to the system.
等于负的这些东西的和，因为它们的定义是,环境对系统所做的功。
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surroundings do on the system.
被定义为外界向系统做的功。
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