pressure boundary

例句：

1. 1. Thepressure boundary is the point at which thefluid pressure equals the atmospheric pressure.
   压力边界是流体压力等于大气压力的点。
2. 2. Thepressure boundary is critical forunderstanding the behavior of gasesin confined spaces.
   压力边界对于理解气体在受限空间中的行为至关重要。
3. 3. Thepressure boundary is a crucial factor in determiningthe safety of underground mining operations.
   压力边界是确定地下采矿作业安全性的关键因素。