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 packing头部填密head of mast杆塔顶部head closure头闭包head catcher头部固定器:X线摄影用head sprocket铺顶部链轮head-falsie假发head floating胎头浮动head papillae头乳突head velocity顶端速度head of arrow箭头