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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After the startup, the assistant heat source must be kept on, otherwise, the heat pipe could not work normally, but there was no need to satisfy the ratio mentioned above.

正常启动后，辅助热源不能关闭，否则热管将不能正常工作，但是不再需要满足上面的比例关系。

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