More severe cases may be treated with a CPAP machine, so named because they maintain constant positive air pressure to the wind pipe to help users breathe easy at night.

严重一点的患者可能就得用CPAP机来治疗了，人们给它取这个名字是因为它能够给气管提供稳定的空气压力，借以帮助患者在夜间呼吸。

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USES frequency conversion control system, can real time monitoring gas supply lines gas pressure, make the gas supply pipe gas pressure constant, improve the production efficiency and product quality.

采用变频控制系统后，可以实时监测供气管路中气体的压力，使供气管路中的气体的压力保持恒定，提高生产效率和产品质量；

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In the case of constant pipe diameter, lengthening the length of vacuum tube is an effective way to increase the total heat of solar water heater!

在管径恒定的情况下，加长真空管的长度是增加太阳能热水器总得热量的有效途径和方向！

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At 8:20 p.m. on the day of the explosion the pressure data suggest there was a constant flow of sea water being pumped into the drill pipe that was displacing the heavier mud system which was the primary pressure control for the well.

WSJ: The Oil Disaster Is About Human, Not System, Failure