词汇	step core bit
释义	step core bit 机梯形钻头
随便看	Keep left along the wall Keep Leicester English facebook group Keep Leicester English facebook group! keepless keep level up keep level with keeplike keep-like tower keep lines together keeplist keep list Keep lookout for sound and visual signals keep/lose track of somebody/something keep low keep/maintain one's health keep/maintain one's youth keep/maintain/preserve the attitude Keep market in good order Keep me advised of further developments keep means keep measure keep measure s keep measures with keep measures with someone keep measures with somone