Results for « 埋头孔 » (cmn)
03117642-n
扩孔, 埋头孔, 镗孔
counterbore, countersink, countersink bit
     a bit for enlarging the upper part of a hole
03118051-n
埋头孔
countersink
     a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface

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