发动机和转速单位在这两种抛光机上的振蒎是一个偏圆心的运动。
The motors and drive units on these two types of polisher's oscillate in an eccentric circular motion.
由于地球自转速率发生偏离，因此当把地球绕中轴旋转一圈作为一个单位时，（这种偏离）就相当于一秒钟时间。
Since Earth’s rotation rate varies, so would the value of one second when it’s defined as a fraction of the time it takes for one spin of the Earth on its axis.
因此，双螺杆压缩机与蜗杆压缩机相比，在相同转速下单位内排气次数少，气流脉动大，气流噪声大。
Therefore, double screw compressor and worm compressor compared, in the same speed of the units inside less number of exhaust air ripple, big air flow noise.
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