四部分的外层封皮充满空气用来保持与大气的压力相协调。
The outer envelope of all four sections contains air maintained at atmospheric pressure.
现有的气囊导管由于采用了新的耐高压材料,可施用高达30个大大气的压力进行扩张。
The present balloon catheter could utilize up to 30 atmospheric pressure for dilatation due to the adoption of new high-pressure resistance materials.
托里切利在水银气压计方面的研究表明大气的压力可以让气压计中的水银柱上升30多英尺。
Torricelli's work on water barometers showed that the pressure of the atmosphere could balance a column of water just over30feet in height.
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