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1·However strong you are, there's always someone stronger.; For every able person there is always one still abler.

强中自有强中手， 能人背后有能人。《新英汉大辞典》

2·She's an abler teacher than he is.

同他相比，她是一个更为称职的老师。

3·He is an abler man than I thought.

他这个人比我想象的还要能干。

4·They were both conscientious scholars, but Davis was out and away the abler of the two.

两个都是脚踏实地、埋头苦干的学者，但戴维斯更有才干。