having the ability, power, or qualities to be able to do something: Only the Democratic Party is capable of running the country. A force ten …
这个是基本函数. f (x)=have x. 其中f (x)=to do，x=ability 映射关系 have. 比如 f (x)= to play basketball well. X 相对应的 X 往往是well-built …
be able to 可以替代 can，译为：有能力做某事. be able to is possible instead of can, means: have acility to do something. be able to 后接动词原形, …
更多内容请点击：【英语学习】语法贴士 第一期 Can/could/be able to - 知乎