double-cone bittwin-cone bittwo-cone bittwo-roller bit双: two; twin; both; dual牙轮钻头: tri-cone rotary drill bit独牙轮钻头: zublin bit六牙轮钻头: six-roller bit三牙轮钻头: three roller bit; three-cone bit; three-roller bit; tricone bit; tricone rock bit; trionebit下载手机词典可随时随地查词查翻译
