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  1. percussion drilling
  2. American system drill
  3. cable-system drill
  4. churn drill

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belt-furnace, belting, beltline, beltloop, beltman, belts, beltsaw, beltscanner, beltstower, belt-tightening,

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顿悟测验, 顿悟经验, 顿悟说, 顿悟学习, 顿足, 顿钻, , 遁词, 遁辞, 遁辞的,