设计主要用于压差和空气速度测量。
It is designed for both differential pressure and air velocity measurements.
空气速度的测量，典型的单位为每分钟英尺或米。
Measurement of air speed, typically in feet or meters per minute.
机身上流动的空气速度减慢，所以引擎的吸氧量减少从而节省了燃料。
Air slipping along the fuselage moves slower, so the engines ingest less oxygen and burn less fuel.
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