... drop percussion 释义：落槌叩诊 deep percussion 释义：重叩诊 fist percussion 释义：拳叩诊 ...
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percussion deep 重叩
For a long time, they used percussion drilling - which basically means they hammered away at the ground to get as deep as they could get.
很长时间里他们用冲击钻井——基本上就是不停地砸地面，直到砸不动。
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