没有必要再做无用功.

There is no need to reinvent the wheel.

你的朝拜会是无用功。

Your pilgrimage may end up being fruitless.

无用功会给你安心、轻松的工作。

Busywork can give you a reassuring, small-bore task.

也就是说,我这几天做得都是无用功了?

Does that mean all I have done in these days is useless?

其它的任何动作都是在浪费时间和做无用功。

Anything else is a waste of your time and future productivity.

由于思路不对, 所以你们做的都是无用功.

Since you are not on the right track, everything you have done is futile.

尽管这是一项无用功,但该禁令并非没有成本.

While it is a displacement activity, the ban is not costless.

还是把心思放在有意义的行动上吧，别做无用功了。

Commit to meaningful action rather than involving yourself in meaningless action.

“给猪涂上口红，它还是猪。”意思是做无用功。

You can put lipstick on a pig, but it is still a pig.

理解它可以帮助我们更好地做出决策，并避免无用功。

Understanding how it works can help us all make better decisions-and show where we might be overreaching ourselves.