何乐不为 Why not?
Explanation
指有什么理由不去做呢？表示很乐意去做。
What reason is there not to do it? It expresses a willingness to do something.
Origin Story
话说唐朝时期，长安城外有一条小河，由于年久失修，河道淤塞，经常泛滥成灾，严重影响了附近百姓的生产生活。一位名叫李白的年轻秀才，看到百姓受苦，心中十分同情。他决心要治理这条小河，让百姓过上安居乐业的生活。于是，他四处奔走，动员乡亲们一起参与治河工程。起初，乡亲们因为治河工程艰巨，又没有报酬，所以都犹豫不决。李白并没有气馁，他耐心细致地向乡亲们解释了治河的重要性，以及治河成功后带来的好处。他还承诺，只要大家积极参与，他就想办法给大家提供一些食物和必要的工具。在李白的热情感染下，乡亲们都被他的精神所打动，纷纷表示愿意参与到治河工程中来。大家一起齐心协力，克服了重重困难，终于将小河治理得清澈见底，两岸绿树成荫。从此，百姓们安居乐业，再也没有遭受洪水的侵害。李白的故事，也成为了后人学习的榜样。
In the Tang Dynasty, there was a young scholar named Li Bai who witnessed the suffering of the people who lived near Chang'an. Their lives were constantly threatened by the neglected, clogged river. He decided to take on the task and the project himself, but initially, the people were hesitant to get involved. Yet, Li Bai managed to inspire them with compassion and a promise to supply them with food and tools, until they finally agreed. Together, they carried out the project successfully, and the river was cleared and thrived once more.
Usage
作宾语、状语；表示很乐意去做某事。
As an object or adverbial modifier; to express that one would like to do something very much.
Examples
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这样的好事，何乐而不为呢？
zhe yang de hao shi, he le er bu wei ne?
Why not do such a good thing?
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周末去郊游，何乐而不为？
zhou mo qu jiao you, he le er bu wei?
Why not go for a weekend trip to the countryside?