ability
词根词缀：
ability n. 能力
abil 能 + ity 具备某种性质，状况 → 能力
able adj. 能够的
debility n. 虚弱
de 去掉 + bility〔=ability〕能力 → 使能力失掉 → 虚弱
debilitate v. 使衰弱
de 去掉 + bilit〔= abili〕能 + ate 做，造成，使… → 去掉能力 → 使衰弱
habilitate v. 装备；使具备能力
habilit〔= abili〕能 + ate 做，造成，使… → 装备；使具备能力
rehabilitate v. 使康复；改造（罪犯）
re 重新 + habilitate 装备；使具备能力 → 重新获得能力 → 使康复
数据来源：新东方英语词汇速记大全
相关例句：
They tackled them to the best of their ability.
他们竭尽全力给予解决。
They are deprived of the ability to exercise the most rudimentary workers 'rights.
他们被剥夺了行使最基本的工人权利的资格。
The students are sorted into three ability groups
学生们被按照各自的能力分成了3个组。
The ability to work collaboratively is a true test of leadership
与人合作的能力是对领导能力的一种真正检验。
It is clear that the ability to smile is inborn.
显然，笑的能力是与生俱来的。
The American economy, and its ability to compete abroad, was slowing down according to the report.
根据这项报告，美国经济及其海外竞争能力发展的速度开始放缓。