Each pound of refrigerant circulating in the system must do its share of the work .

每一磅的冷媒循环在系统中，必须尽自己的本份的工作。

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Each pound of refrigerant circulating in the system must do its share of the work .

每一磅的冷媒循环在系统中，必须尽自己的本份的工作。

youdao