前功尽弃的英文：
[Literal Meaning]
former/effort/all/lose
All the previous efforts are wasted.

[解释]
以前的努力全部白费。

[Explanation]
All that has been achieved is spoiled.

[例子]
你已经快要拿到博士学位了，一定不要前功尽弃。

[Example]
You are about to earn your PhD degree and should not waste all the previous efforts.

[英文等价词]
to fall by the wayside
blow off one's dogs
go by the board
pass by the board

all labour lost;waste all the previous efforts;All previous work is wasted
前功尽弃

All our previous efforts were wasted because of his imprudence.
他的轻率使我们前功尽弃。

If we stop where we are, all our previous efforts will be wasted.
如果我们就此止步，就会前功尽弃。

The dam must be closed before the rainy season sets in, or all our labour will be lost
大坝一定要在雨季开始以前合拢，否则就会前功尽弃。

If his plan isn't approved of by the Committee, all his work will have been wasted.
如果委员会不同意他的计划,他便前功尽弃了。