| 单词 | counterboring |
| 释义 | > as lemmasˈcounterboring ˈcounterboring n. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging counterboring1905 society > occupation and work > industry > working with tools or equipment > fastening > [noun] > with screws > sinking screw-head into hole counterboring1905 1905 J. Horner Tools for Engineers & Woodworkers xi. 125 Every one knows the trouble of counterboring in wood. 1909 Cent. Dict. Suppl. Counterbored, counterboring. 1948 A. P. Morgan Tools xii. 209 Counterboring of small diameter can be done by hand power. 1984 E. P. DeGarmo et al. Materials & Processes in Manuf. (ed. 6) xxi. 599 Counterboring provides an enlarged, cylindrical hole with a flat bottom so that a bolt head, or a nut, will have a smooth bearing surface that is normal to the axis of the hole. < as lemmas |
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