... poundspersquarefeet磅英尺2 poundspersquarefoot磅平方英尺 poundspersquarefoot磅平方英尺磅英尺2 ...
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和音爆有关的气压变化只有每平方英尺几磅——大约是坐电梯向下两到三层所感受到的气压变化。
The change in air pressure associated with a sonic boom is only a few pounds per square foot — about the same pressure change experienced riding an elevator down two or three floors.
音爆是以每平方英尺的超压磅数来测量的。
Sonic booms are measured in pounds per square foot of overpressure.
这很难找到一个窗口的机器重量轻于46磅，而这样的机器也只能够凉快相当小的房间(150平方英尺或以下)。
It's tough to find a window unit that's lighter than 46 pounds-and a machine like that would be able to cool only a fairly small room (150 square feet or less).
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