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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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雨点以每分钟大约五百到一千英尺的速度下降。
Raindrops fall at a speed of about 500 to 1,000 feet a minute.
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雨点以每分钟大约五百到一千英尺的速度下降。
Raindrops fall at a speed of about 500 to 1,000 feet a minute.
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