但是随着引擎体积的增大，次生振动变得难以忍受。
But as the engine size increases, the vibration eventually becomes intolerable.
爆炸震源的地震纵波是脉冲性质的。周期振动是地震脉冲引起的次生振动。
A primary seismic wave from an explosive source is a pulse response, and its periodic vibration originates from seismic pulses.
Lanchester的设计中，两个平衡轴以两倍于机轴转速，反向地转动，抵消了无用的次生振动。
In Lanchester's design, two balance shafts rotated in opposite directions at twice the crankshaft speed to cancel out the niggling secondary vibrations.
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