扩锥孔器countersinking: 锥形扩孔; 钻埋头孔; 钻锥坑; 锪孔; 锪锥孔countersink tooth crown: 钉孔冠countersinking bit: 埋头钻; 平头钻头countersink screw: 沈头螺钉countersinking bit in three pieces: 三件埋头钻下载手机词典可随时随地查词查翻译