孜孜不倦 diligent and tireless
Explanation
孜孜不倦，形容勤奋努力，不知疲倦。
Zīzībùjuàn describes diligent and tireless efforts.
Origin Story
远古时代，大禹为了治理洪水，带领百姓开山凿石，疏通河道。他日夜兼程，风餐露宿，从不懈怠，最终完成了这项伟大的工程。他的精神感动了无数人，成为后世学习的榜样。大禹治水的故事流传至今，人们用“孜孜不倦”来形容他为民造福，不辞辛劳的精神。即使是在最艰苦的环境下，他也从未放弃，始终坚持着自己的理想和信念，正是这种坚持不懈的精神，最终使他战胜了自然灾害，给百姓带来了安定的生活。这便是大禹，一位伟大的治水英雄，他的故事也成为了中华民族勤劳勇敢，不屈不挠精神的象征。他的精神激励着一代又一代人，为国家和民族的发展做出了巨大的贡献。
In ancient times, the great Yu led the people to control the flood by digging mountains and dredging rivers. He worked day and night, eating and sleeping in the open air, without ever slacking off, and finally completed this great project. His spirit moved countless people and became a model for later generations. The story of Yu's flood control has been passed down to this day, and people describe his efforts for the people's well-being and his tireless dedication with the words "zīzībùjuàn". Even under the most difficult conditions, he never gave up and always held on to his ideals and beliefs. It was this perseverance that ultimately enabled him to overcome natural disasters and bring stability to the people.
Usage
用于形容人勤奋努力，不知疲倦。常用于书面语。
It is used to describe a person who is diligent and tireless. It is often used in formal language.
Examples
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他学习非常刻苦，孜孜不倦地学习专业知识。
tā xuéxí fēicháng kèkǔ, zīzībùjuàn de xuéxí zhuānyè zhīshi.
He studied very hard and tirelessly learned professional knowledge.
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为了完成这个项目，他们夜以继日，孜孜不倦地工作。
wèile wánchéng zhège xiàngmù, tāmen yèyǐjìrì, zīzībùjuàn de gōngzuò。
To complete this project, they worked day and night, tirelessly.