For starters, cabin pressures at high altitudes are set at roughly what they would be if you lived at 5,000 to 8,000 feet above sea level.
对于初学者来说，高海拔地区的舱内压力大致被设定为住在海拔在5000到8000英尺高的地方会有的压力。
Rockets expel the stuff at altitudes three times as high - in the stratosphere more than 40 kilometres above sea level.
而火箭排出物三倍高于飞机- - -在海拔40多千米的平流层。
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