学弹钢琴不容易，你非得下功夫不可。

Learning to play the piano isn't easy. You have to work at it.

这就表明，一个人只要真下功夫，就能做成什么事情。

It just goes to show what you can do when you really try.

因此，应该下功夫努力纠正道德良心的错误。

One must therefore work to correct the errors of moral conscience.

但税收政策不能只是在平息“鹅叫”方面下功夫，而是要在经济活动中用最少的怪招增加更多的财富。

But tax policy should aim to do more than smother protest: it should also seek to raise the most money with the least distortion to economic activity.

就连恩里科·费米显然也没有下功夫好好拜读哈泽内尔的著作，才会错误地将3／4前因数的误差归咎于亚伯拉罕的电子自能。

Even Enrico Fermi apparently did not bother to read Hasenöhrl's papers properly before concluding wrongly that the discrepant 3/4 prefactor was due to the electron self-energy identified by Abraham.