• 1. constant pressure surface: 恒压面
• 2. constant-pressure surface: 等压面
• 3. constant t pressure surface: 等压面

• 1.Brought about by the constant pressure of lying on a stationary surface, painful ulcers can involve substantial skin loss, sometimes exposing muscle and even bone.
  由于躺在静止的平面上持续产生的压力，疼痛性溃疡会伴随大面积皮肤脱落，有时露出肌肉，甚至骨头。
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• 2.Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.
  地球表面的气压相对稳定，因此设计地面用的传音器，工程师并不需烦恼气压的大幅变化。
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• 3.While the pressure difference between the inlet of fracture and the outlet of fracture is constant, the transmissibility of fracture surface will decrease with the rising fractal dimension.
  在对裂隙两端施加相同压力差的条件下，裂隙面的等效导水系数会随着分形维数的增加而降低。
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