percussion bit

• [机]冲[撞]钻头

percussion bit的用法和样例：

例句

1. Run subsea TV to observe bit entering the TGB.
   下水下电视观察钻头是否进入导向基板。
2. Drilling ceramic tile requires a speical bit.
   在瓷砖上钻孔需要特殊的钻头。