下功夫的英文：
1.to put in time and effort

If you want to pass that exam, you'll have to knuckle down (to some hard work)
你要想考试及格,就得开始下功夫(苦干)了

We must take pains to do meticulous work among the masses.
我们必须下功夫在群众中做细致的工作。

"At Princeton, language teachers make special efforts to keep their subjects interesting."
在普林斯顿大学，语文教师特别下功夫，使他们的课程增添趣味性。

put a crimp into
妨碍|束缚

Put on the screw
施加压力

strike [ put on ] a pose of
装出...面貌[样子]

discrimination time
辨别时间辨别时间

It is time to go.
该走了。

They are not in step with the times.
他们跟不上时代的步伐。

It was a vain effort.
这种努力是徒劳无益的。

That effort will be bootless.
那种努力将是无益的。

You must not relax your efforts.
你不可以松懈你的努力。