The cutting part of a drill usually pointed and threaded and is replaceable in a brace or bitstock or.

钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换用在柱柄或上。

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The cutting part of a drill usually pointed and threaded and is replaceable in a brace or bitstock or.

钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换用在柱柄或上。

youdao