a. (usually followed by `to') having the necessary means or skill or know-how or authority to do something
s. have the skills and qualifications to do things well
s. having inherent physical or mental ability or capacity
s. having a strong healthy body
a. 能干的, 能够的
1. She is able to speak three languages fluently.
她能流利地说三种语言。
2. I hope to be able to travel next summer.
我希望明年夏天能去旅行。
3. He is able to solve difficult math problems quickly.
他能快速解决困难的数学题。