常见例句A tooth with a broad crown used to grind food,located behind the premolars.臼齿一种用作研磨食物的有宽齿冠的位于前磨牙后的牙齿。Perhaps that's because the premolars were doing all the hard work, he suggests.他建议道，也许那是因为前磨牙做着所有艰辛的工作。 返回 premolars