因为对不可逆过程，系统内部的压强，没有明确的定义，气体不处于平衡态。
Because if it's irreversible, it's very likely that I don't know what the pressure inside the system is doing while this is happening.
因为对不可逆过程，系统内部的压强，没有明确的定义，气体不处于平衡态。
Because if it's irreversible, it's very likely that I don't know what the pressure inside the system is doing while this is happening.
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