And there is no work done on the surroundings because pressure is zero.
这里系统没有对环境做功，因为压强是零。
First let's set the external pressure equal to zero.
首先，让外部压强为零。
全开状态零压降。
The density of solids under zero temperature and zero pressure is an important physical parameter.
固体在零温零压下的密度是一个重要的物态参数。
Draw off system water until boiler pressure reads zero.
将系统中的水排出，直到锅炉压力读数降为零。
Draw off system water until boiler pressure reads zero.
将系统中的水排出，直到锅炉压力读数降为零。
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