head onadv.迎面地headn.头部；头脑；顶端；领袖；硬币的正面v.前进；为首；朝向adj.首要的；前面的head rotation磁头走向；头部转向headless nail无头钉headtelephonen.头戴受话器head delivery顺产,头位分娩Head Training培训主任head ornament顶饰head a revolt带头造反Head-Impact头部碰撞head traction[医] 头部牵引head response磁头频响