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Sound travels at 1100 feet per second in air.
声音在空气中以每秒1100英尺的速度传播。
youdao
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The exit velocity is typically in the low-hundreds of feet per second.
出口速度一般在每秒几百英尺左右。
youdao
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The exit velocity is typically in the low-hundreds of feet per second.
出口速度一般在每秒几百英尺左右。
youdao