冲击式钻头;顿钻钻头

chopping bit的用法和样例：

例句

A good way to help you to improve drilling technique is to use a jet bit.能帮助你们改进钻井技术的一种好方法是使用喷射式钻头。

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学英语单词

a millstone round one's neck

available per mu yield

berk

bibis

bill of exceptions