Shocks are formed by merge of compression waves with each other and its magnitude is enhanced or declined by catching compression waves or expansion waves behind the shock respectively.

压缩波的合并产生激波，它的强度被随后并入的压缩波或膨胀波分别增强或减弱。

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Airbag sensors and other components of the collision and shock is very sensitive, so we should try to avoid collision and impact, so as to avoid the sudden expansion of the airbag unnecessary.

安全气囊传感器等部件对碰撞和冲击很敏感，因此应尽量避免碰撞和冲击，以免造成安全气囊不必要的突然展开。

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At the region near the nozzle exit, a vibrating flow phenomenon is found, which is associated with the expansion waves and shock waves reflections inside the gas jet.

发现了在接近喷嘴出口的区域里，出现了与射流内的激波、膨胀波有关的振荡流。

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If the market were to fall another 20%, say, the shock to American consumers might be enough to bring the country's long expansion to an end.

ECONOMIST: Heading for meltdown? | The