几分钟后，警察对这位先生说他并没有停车，他只是减了一点速。
After several minutes, the cop explained to the gentleman that he didn't stop, he just slowed down a little.
本文对带折流板式填料塔的流体力学性能进行了探讨，介绍了实验情况，提出了压降和泛点气速的计算式。
This paper discusses fluid mechanics performance of packed tower with baffle, describes cases of experiment and presents computational equation for pressure drop drop and flooding velocity.
声矢量传感器是一种新型传感器，它可以空间共点，同时测量声场中的声压和振速信息。
The acoustic vector hydrophone is a new type sensor, which can simultaneously measure the pressure and particle velocity of the same point in acoustic field.
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