No flow of water occurs through the pipe unless there is a difference in pressure.
若没有不同的压力给管道的话，那么就不可能有流动的水通过管道。
This is due to the difference between the pressure and the temperature in the car engine system.
这是由于不同的压力和温度之间在汽车发动机系统。
This difference in speed produces a difference in air pressure.
速度上的差异就产生了气压的差异。
This difference in speed produces a difference in air pressure.
速度上的差异就产生了气压的差异。
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