hammer drill
柯林斯詞典
1. N a rock drill operated by compressed air in which the boring bit is not attached to the reciprocating piston 沖擊式鉆機; 鉆片不在擺動的活塞之上，通過壓縮空氣操作的巖石鉆機
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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 沖擊式鉆機; 鉆片不在擺動的活塞之上，通過壓縮空氣操作的巖石鉆機