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This difference in lift can make it hard to maintain level flight.
这种差异能够产生保持直升机水平飞行的升力。
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The air pressure in a plane during flight is lower than at sea level.
飞行中飞机内的气压低于海平面的大气压。
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The air pressure in a plane during flight is lower than at sea level.
飞行中飞机内的气压低于海平面的大气压。
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