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.
起初，吉林用激光束测量光在这些空气样本中的传播速度。
Originally, Keeling measured the speed of light in the air samples with a laser beam.
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.
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