1. Child – children
1.孩子

2. Man – men
2.男人

3. Datum – data
3.數(shù)據(jù)

4. Criterion – criteria
4.標準

5. Medium – media
5.媒質(zhì)

6. Foot –feet
6.腳，英尺

7. Tooth – teeth
7.牙齒

8. Mouse – mice
8.老鼠

9. Sheep – sheep
9.羊

10. Crisis – crises
10.危機

11. Stimulus – stimuli
11.刺激

12. Thief – thieves
12.賊，小偷

13. Wolf – wolves
13.狼

14. Leaf – leaves
14.葉子

15. Person – people
15.人

16. Life – lives
16.生命

17. Goose – geese
17.鵝

18. Thesis - theses
18.主題

19. Potato – potatoes
19.土豆

20. Cactus – cacti
20.仙人掌