hammer drill
柯林斯词典
1. N a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston 冲击式钻机; 钻片不在摆动的活塞之上，通过压缩空气操作的岩石钻机
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1. N a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston 冲击式钻机; 钻片不在摆动的活塞之上，通过压缩空气操作的岩石钻机