able本身作形容词。
able：adj.能；能够；有才智的；有才能的；(某方面)擅长的
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。
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