21. constant adj.经常的，不断的

     I don’t like the constant arguments with you.我不喜欢跟你没完没了的争论。

     Change is constant in history.历史上变化是不断的。

    22. creature n. animal or being of some kind动物，生物，人

     Did you go to the show of the photos of some creatures from outer space?你去看来自外空生物的照片展览了吗？

     That poor creature had no family at all.那个可怜的家伙根本没有家。

    23. debate n.讨论，辩论

     A public debate about that is suggested.有人建议就此展开公开讨论。

     There has been much debate about the effect of the medicine.关于这种药物的疗效还有很多争议。

    v.讨论，辩论

    What are the two sides debating about?他们双方在为什么辩论？

     The future of the nuclear industry will be debated in government soon.核工业的未来不久就要在内阁讨论。

    24. decorate vt.装饰----，修饰----

     She brought some beautiful pictures to decorate the walls of her room.她带来一些漂亮的图画来装饰房间的四壁。

     We’re decorating the kitchen again this autumn.我们秋天要重新装修厨房。

    25. decrease v.减少，减轻，减弱

     The corporation decreased the number of workers.那家公司裁减了员工。

     Interest in the game is decreasing.人们玩那种游戏的兴趣渐渐消退。

    26. delete v.删去

     If you delete 80 words, we can put the whole passage on two pages.如果你删去80字，我们就可以将这一整篇文章放在两页纸上了。

     Why did you delete his name from the list?你为什么把他的名字从名单中删掉了？

    27. differ v.相异，有区别

     On the right stand rows of big houses differing one from another in the color of their front door.右边耸立着一排排大房子，只是他们的前门颜色不一样。

     The climate in the south differs from that in the north.南方的气候与北方的迥然不同。