7.defective和deficient

　　defective (having a fault or flaw)“有缺陷的”。

　　deficient (lacking in what is needed)“不足的”;be deficient in欠缺。28.definite和definitive

　　definite (certain or clear, not vague)“明确的，一定的”。

　　definitive (authoritative, that cannot be improved)“限定的，决定性的，最后的”; definitive host宿主;definitive organs定形器官;definitive sentence最后判决。

　　9.dependant和dependent

　　dependant n.(one who depends on another for support)受赡养者。

　　dependent adj.“依靠的，依赖的”;He'sstill dependent on state benefit. The rate of relief is dependent on one's income.

　　10.discreet和discrete

　　discreet“考虑周到的，慎重的”。

　　discrete“分离的，分裂的”;On closer examination, we find that the pattern is formed from thousands of discrete dots of colors.