a. 残废的, 有缺陷的, 失效的【计】 失效的

◆记忆方法一：
联想方式：dis；abl（e）；ed
记忆方法：dis表示否定的前缀

blind/deaf/dumb/lame/disabled/bind
记忆：
1. blind [ blaind ] adj. 瞎的, 盲目的 It’s like a blind man on a blind horse.这就象是盲人瞎马。 格言： Among the blind the oneeyed man is the king.山中无老虎猴子称大王.
2. deaf [ def ] adj. 聋的 You can’t turn a deaf ear to our advice. 你不能对我们的劝告充耳不闻。
3. dumb [ dQm ] adj. 哑的, 无说话能力的, 不说话的 They remained dumb at the meeting. 他们在会上一直没有说话。
4. lame [ leim ] adj. 跛足的 Lame from the accident, he walked with a cane. 他那次事故跛足后，就带着拐杖走路。
5. disabled [dIs5eIb(E)ld] adj. 伤残的 When designing a building, the designer must think of the disabled people and try to offer them convenience. 设计师在设计大楼时必须考虑到残疾人，并且设法为他们提供方便。
6. bind [ baind ] v. 绑, 约束 Sure bind, sure find. 扎的牢, 丢不了。
另类阅读：
We should help disabled people: the blind(people who can’t see), the deaf(people who can’t hear), the dumb(people who can’t speak) and the lame(people who can’t walk normally because there is something wrong with their legs).