按要求写单词 teeth 牙齿(复数) tooth (单数) wash
man-men; woman-women; foot-feet; tooth-teeth; goose-geese
womanwumnwomenwimin女人5,goosegusgeesegis鹅6,toothtuteethti牙二
foot-feet tooth-teeth mouse-mice 二,一般现在时动词的第三人称单数
知识扩展: teeth 牙齿 (复数) tooth 牙齿 toothbrush (单数) 牙刷