n. 无力, 无能, 残疾【医】 劳动能力丧失, 病废

able/unable/disable/disabled/ability/disability/competence/talent
记忆：
1． able adj. 有能力的 Mary is an able girl. be able to(时态丰富、强调结果) can(强调可能性) He can swim, but last week he wasn’t able to swim across the river as he didn’t feel well at that time. 他会游泳，但他上周他未能游过河，因为他当时感到不舒服。
2． 加否定前缀un-, unable adj. 无能的；He is unable to speak Russian. 他不会讲俄语。
3． 加否定前缀dis-且转为动词, disable vt. 使……失去能力 The accident disabled him physically, but never mentally. 那场意外使他身患残疾，但他精神很健全。
4． 加表示被动的后缀-ed, disabled adj. 被夺取能力的，残疾的 We should help the disabled. 我们应该帮助残疾人。
5． 加名词后缀-ity变为名词：ability n. 能力 We are trying our best to develop our organizing ability. 我们正尽力发展我们的组织能力。
6． disability n. 残疾 People with disability can also be successful. 残疾人也能成功。
7． competence com-pet-ence The state or quality of being adequately or well qualified; ability. compete, 竞争，competence, 竞争的本事， n. 能力 You should employ the people with the necessary competence. 你应当雇用有相应能力的人。
8． talent A marked innate ability tal-ent tal, tall, 高，名词后缀-ent表示人；talent, 高人，有才干的人 n. 天才, 才干, 才能 Alice has the talent for music. 爱丽丝有音乐天赋。
另类阅读：
I’m glad that I am able to form the ability to get on well with others. I hear that some people of talent are unable to communicate well with others, which will bring bad effect on their competence. As we know, jobs often call for cooperation. A man weak in communication is disabled in some way.