1.孩子
2. Man – men
2.男人
3. Datum – data
3.数据
4. Criterion – criteria
4.标准
5. Medium – media
5.媒质
6. Foot –feet
6.脚，英尺
7. Tooth – teeth
7.牙齿
8. Mouse – mice
8.老鼠
9. Sheep – sheep
9.羊
10. Crisis – crises
10.危机
11. Stimulus – stimuli
11.刺激
12. Thief – thieves
12.贼，小偷
13. Wolf – wolves
13.狼
14. Leaf – leaves
14.叶子
15. Person – people
15.人
16. Life – lives
16.生命
17. Goose – geese
17.鹅
18. Thesis - theses
18.主题
19. Potato – potatoes
19.土豆
20. Cactus – cacti
20.仙人掌
