一劳永逸 once and for all
Explanation
一劳永逸，是指一次努力就能解决问题，以后就不用再费心劳神了。它形容能够从根本上解决问题，取得持久的效果。
Once and for all means to solve a problem with one effort and no more worry about it in the future. It describes the ability to solve a problem fundamentally and achieve lasting effects.
Origin Story
从前，在一个偏远的小村庄里，住着一位名叫老张的农民。老张家境贫寒，为了养家糊口，他每天都要辛苦地在地里劳作。然而，他的收成却总是很微薄，日子过得十分艰难。 有一天，老张去镇上赶集，在集市上遇到了一位算命先生。算命先生看出了老张的困境，便对他说道：“老张，你命里注定要过苦日子，但只要你肯努力，总会有翻身的机会。我这里有一件宝贝，可以帮助你一劳永逸地摆脱贫困。” 老张听后十分高兴，连忙向算命先生询问是什么宝贝。算命先生神秘地一笑，从口袋里拿出一粒种子，对老张说：“这颗种子叫做‘聚财种’，你只要把它种在自家田地里，它就能结出金银珠宝，让你从此过上富裕的生活。” 老张半信半疑地接过种子，回家后就迫不及待地把它种在了自家的田地里。他每天都细心地照料它，盼望着它早日开花结果。然而，过了好长一段时间，种子仍然没有任何动静。老张渐渐地失望了，他开始怀疑算命先生的话是不是骗人的。 就在老张快要放弃的时候，种子终于发芽了。它生长得非常迅速，很快便长成了一棵参天大树。老张惊喜万分，他每天都站在树下，看着它枝繁叶茂，期待着它能结出金银珠宝。 可是，令老张失望的是，树上结出的果实并非金银珠宝，而是一种普通的水果。老张非常沮丧，他觉得算命先生欺骗了他。 这时，一位老乡路过，看到了老张的沮丧表情，便问他发生了什么事。老张就把事情的经过告诉了老乡。老乡听后笑着说：“老张，你犯了一个错误，就是太相信算命先生的话了。你以为种下这颗种子就能一劳永逸地富裕起来，却忽略了努力的重要性。其实，真正的宝藏就在你自己的手中，只有通过勤劳的双手，才能获得真正的财富。” 老张听了老乡的话，顿时茅塞顿开。他意识到自己错了，不应该一味地追求一劳永逸，而应该脚踏实地地努力工作。从那以后，老张更加勤奋地耕作，他的收成也越来越好，日子也渐渐地富裕起来。
Once upon a time, in a remote village, lived a farmer named Zhang. Zhang was poor and had to work hard in the fields every day to make a living. However, his harvest was always meager and his life was very difficult. One day, Zhang went to the town market and met a fortune teller. The fortune teller saw Zhang's plight and said to him, “Zhang, your destiny is to lead a hard life, but as long as you work hard, you will always have a chance to turn things around. I have a treasure here that can help you get rid of poverty once and for all.” Zhang was overjoyed and quickly asked the fortune teller what the treasure was. The fortune teller smiled mysteriously and took a seed out of his pocket. He said to Zhang, “This seed is called ‘wealth seed’. You just have to plant it in your own field and it will bear gold and jewels, making you rich for life.” Zhang took the seed with hesitant belief and planted it in his own field as soon as he got home. He carefully tended to it every day, hoping that it would soon bloom and bear fruit. However, after a long time, the seed still did not do anything. Zhang gradually became discouraged and began to doubt whether the fortune teller's words were a lie. Just when Zhang was about to give up, the seed finally sprouted. It grew very fast and soon became a huge tree. Zhang was ecstatic. Every day he stood under the tree, watching its lush foliage and expecting it to bear gold and jewels. However, to Zhang's disappointment, the tree did not bear gold or jewel fruits, but only ordinary fruits. Zhang was very depressed and thought that the fortune teller had cheated him. At this moment, an old acquaintance passed by and saw Zhang's depressed expression. He asked him what had happened. Zhang told the acquaintance the whole story. The acquaintance smiled and said, “Zhang, you made a mistake by trusting the fortune teller's words too much. You thought that planting this seed would make you rich forever, but you ignored the importance of hard work. Actually, the real treasure is in your own hands. Only through hard work can you achieve true wealth.” Zhang listened to the acquaintance's words and was suddenly enlightened. He realized that he was wrong and should not constantly pursue a simple solution, but instead should work hard. From that day on, Zhang worked even harder, his harvest got better and better, and his life gradually became prosperous.
Usage
这个成语主要用来形容一次努力就能解决问题，以后就不用再费心劳神了。在生活、工作和学习中，我们常会遇到一些问题，如果能找到一劳永逸的解决方法，就能省心省力，取得持久的效果。
This idiom mainly describes the situation where one effort can solve a problem and no more worry about it in the future. In life, work, and learning, we often encounter problems. If we can find a once-and-for-all solution, we can save time and effort and achieve lasting results.
Examples
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他希望能够一劳永逸地解决这个问题，这样以后就不用再操心了。
tā xī wàng néng gòu yī láo yǒng yì de jiě jué zhè ge wèn tí, zhè yàng yǐ hòu jiù bù yòng zài cāo xīn le.
He hopes to solve this problem once and for all so that he doesn't have to worry about it anymore.
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为了达到一劳永逸的效果，他们付出了巨大的努力。
wèi le dá dào yī láo yǒng yì de xiào guǒ, tā men fù chū le jù dà de nǔ lì.
They made great efforts to achieve a lasting effect.
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学习要掌握方法，不能一劳永逸，要勤学苦练。
xué xí yào zhǎng wò fāng fǎ, bù néng yī láo yǒng yì, yào qín xué kǔ liàn.
Learning requires mastering methods. You cannot rely on one-time success, but must practice diligently and work hard.