He's well able to take care of himself.
他完全能够自理。
I've never been able to work her out.
我从未能摸准她的秉性。
You need to be able to work as part of a team.
你必须能作为团队的一员去工作。
They were able to come and go at will.
他们能够来去自由。
They were able to achieve a settlement without using military force.
他们没有诉诸武力就解决了问题。