Now blacksmiths use pneumatic hammers which produce less noise but are also less productive than the first ones.
如今，锻造师们使用风动锤，因为它的噪音更小，但是生产效率则不及以前。
Road workers use pneumatic hammers to break up pavement.
筑路工人用气动钻钻碎路面。
The trenchless pneumatic hammers which don t rotate themselves during drilling include impact moles, pipe ramming hammers and pipe bursting hammers.
穿孔过程中自身不回转的非开挖气动锤包括冲击矛、夯管锤和爆管锤。
But the matching impact bits often dropped off from the pneumatic hammers and led the well accident caused by complex factors.
但是，空气锤、特别是配套冲击钻头断脱导致的井下事故时有发生，影响因素极为复杂。
Then the mutual affection of multi-pneumatic-hammers was studied using the theory of elasticity wave and random modulation.
然后利用弹性波理论和信号随机调制理论，分析了多路随机振动互相作用。
Then the mutual affection of multi-pneumatic-hammers was studied using the theory of elasticity wave and random modulation.
然后利用弹性波理论和信号随机调制理论，分析了多路随机振动互相作用。
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