一暴十寒 a day's exposure to the sun followed by ten days of frost
Explanation
比喻学习或工作一时勤奋，一时又懒散，没有恒心。就像植物，如果一天晒太阳，十天让它受冻，是无法生长的。同样，学习和工作也需要持之以恒，不能三天打鱼两天晒网，否则是很难取得成功的。
The idiom “Yi Pu Shi Han (a day's exposure to the sun followed by ten days of frost)” is used to compare studying or working with a plant that cannot grow if it is exposed to the sun for one day and then to ten days of frost. It means that in studying or working, although one may be diligent for a while, then become lazy again, and lacks perseverance.
Origin Story
从前，有一个叫王生的书生，他天资聪颖，但性情懒散，学习时三天打鱼两天晒网。一天，他看到一位老先生在树林里种树，便好奇地问道：“老先生，您种的树怎么长得这么快？”老先生笑着说：“我种树可不是一暴十寒的，我每天都给它浇水施肥，所以它才能长得这么快。”王生听了老先生的话，心中深受启发，他决心改掉自己懒散的毛病，每天坚持学习，终于成为了一名有学问的读书人。
Once upon a time, there was a scholar named Wang Sheng who was very talented but lazy. He studied for three days and then slacked off for two days. One day, he saw an old man planting trees in the forest and curiously asked,
Usage
这个成语用来形容学习或工作没有恒心，三天打鱼两天晒网，就像一棵植物，如果今天晒一天，明天冻十天，是无法生长的一样。
The idiom “Yi Pu Shi Han (a day's exposure to the sun followed by ten days of frost)” is used to describe someone who lacks perseverance in their studies or work, starting and stopping all the time, just like a plant that cannot grow if it is exposed to the sun for one day and then to ten days of frost.
Examples
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学习就像种树，如果今天浇水，明天就让它干旱，它怎么能长得高呢？
xué xí jiù xiàng zhòng shù, rú guǒ jīn tiān jiāo shuǐ, míng tiān jiù ràng tā gān hàn, tā zěn me néng zhǎng de gāo ne?
Learning is like planting a tree, if you water it today and let it dry tomorrow, how can it grow?
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他总是三天打鱼两天晒网，工作效率很低。
tā zǒng shì sān tiān dǎ yú liǎng tiān shài wǎng, gōng zuò xiào lǜ hěn dī.
He always works three days and then two days, his work efficiency is very low.