flat-face bit平底: flat base; flat keel唇: lip金刚石钻头: bort bit; diamond bit; carbo ...圆底唇金刚石钻头: round-face bit半圆底唇金刚石钻头: medium-round nose bit; semiround nose bit; semicircular profile bits下载手机词典可随时随地查词查翻译