jack drill

• 凿岩机

jack drill的用法和样例：

例句

1. The rock drill is indispensable for digging coal mines.
   凿岩机是煤炭采掘不可缺少的工具。
2. The factory was set up for drill production in TAI-CHUNG.
   于台中县青山设工厂，打造凿岩机用钻头。