To waste one's efforts; to be a fruitless endeavor
他为了这个项目熬夜了好几天，最后发现方向错了，所有的努力都白费蜡了。
He stayed up for several nights working on this project, only to find the direction was wrong, and all his efforts were in vain.
Era:
Modern
Frequency:
Next Idiom
To waste one's efforts; to be a fruitless endeavor
Era:
Modern
Frequency: