adj.能够的;有能力的;有才干的;干练的;
例句:
He was able to get the cause behind the effect.
他能够透过这一结果发现其因由.
I haven't been able to orient my ideas to the new conditions.
我还未能使自己的观点适应新情况.
An interval of a year elapsed before we were able to return.
隔了一年我们才得以返回.