尽心竭力 with all one's heart and might
Explanation
指尽心尽力，全力以赴。形容做事十分努力。
It means to work with all one's heart and strength. It describes doing something very diligently.
Origin Story
很久以前，在一个偏僻的小山村里，住着一户人家，家里有一个勤劳的农夫和他的妻子。农夫每天日出而作，日落而息，辛勤耕作，尽心竭力地侍弄着他们的田地。妻子则在家中操持家务，勤俭持家，对农夫也是体贴入微，尽心竭力地照顾他的生活。他们的生活虽然清贫，但夫妻俩相敬如宾，日子过得也其乐融融。然而，天有不测风云，一场突如其来的旱灾席卷了整个村庄，田地干旱龟裂，庄稼颗粒无收。面对突如其来的灾难，农夫并没有气馁，他依然尽心竭力地寻找水源，甚至步行几十里去求助邻村，最终，在邻村的帮助下，他们渡过了难关。
Long ago, in a remote mountain village, there lived a family, a hardworking farmer and his wife. Every day, from sunrise to sunset, the farmer worked diligently in his fields, doing his best to cultivate his land. His wife managed the household chores, was thrifty, and cared for her husband with great consideration. Although their life was poor, the couple respected each other and lived happily together. However, the heavens were unpredictable, and a sudden drought swept through the whole village, causing the fields to dry up and crack, resulting in no harvest. In the face of this unexpected calamity, the farmer did not lose heart. He tirelessly searched for water sources, even walking for dozens of miles to seek help from neighboring villages. Eventually, with the help of the neighbors, they overcame the crisis.
Usage
用于形容做事非常努力，全力以赴。
Used to describe someone working extremely hard and giving their all.
Examples
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他为了这个项目, 尽心竭力, 日夜兼程。
ta weile zhege xiangmu jinxinjiel,riye jiancheng
He worked day and night, devoting himself to this project.
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为了公司的发展, 他尽心竭力, 鞠躬尽瘁。
weile gongsi de fazhan, ta jinxinjiel, jugongjinchui
For the development of the company, he has given his all, working tirelessly.