百思不解 Unable to understand after a hundred thoughts
Explanation
百思不解，指百般思索也无法理解。形容对某事感到困惑，想不明白。
百思不解 literally means 'think a hundred times and still not understand'. It is used to describe when someone is confused and cannot figure something out.
Origin Story
在古代，有一个名叫张三的书生，他勤奋好学，博览群书，但却有一个奇怪的爱好：收集各种稀奇古怪的东西。一天，他在集市上发现了一个奇怪的木盒，盒子上刻着奇怪的符号，他百思不解，怎么也猜不出这是什么，就花重金买了下来。回到家中，他打开木盒，里面竟然是一颗晶莹剔透的蓝色宝石，宝石上也刻着相同的符号。张三更加困惑了，他翻遍了所有的书籍，也询问了许多学识渊博的学者，但都无法解开这个秘密。最终，他决定带着这颗宝石去求教一位德高望重的隐士。隐士看到宝石，微微一笑，说：“这不是寻常之物，而是上古神物，你只需将它放在月光下，它便会显现出它的秘密。”张三恍然大悟，他按照隐士的指点，将宝石放在月光下，宝石顿时发出耀眼的光芒，符号也变得清晰可见，原来它是一张地图，指向了一个遥远的藏宝之地。张三欣喜若狂，他终于解开了这个困扰他许久的谜团。
In ancient times, there was a scholar named Zhang San who was diligent and learned, and read widely, but he had a strange hobby: collecting all kinds of strange and curious things. One day, he found a strange wooden box in the market, with strange symbols engraved on it. He couldn't understand what it was, so he bought it for a lot of money. When he got home, he opened the box and found a crystal-clear blue gem inside, with the same symbols engraved on it. Zhang San was even more confused. He went through all his books and asked many learned scholars, but none could unravel the mystery. Finally, he decided to take the gem to a respected hermit for advice. The hermit saw the gem, smiled slightly, and said, “This is no ordinary object, but an ancient divine object. You just need to put it under the moonlight, and it will reveal its secrets.” Zhang San was enlightened. He followed the hermit's instructions, put the gem under the moonlight, and the gem immediately emitted a dazzling light, and the symbols became clearly visible. It was a map, pointing to a distant treasure trove. Zhang San was overjoyed, he had finally solved the mystery that had plagued him for so long.
Usage
当我们遇到无法理解的事物或问题时，可以用“百思不解”来表达自己的困惑。
When we encounter something we can't understand, we can use
Examples
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我对这个问题百思不解，实在想不明白。
wo dui zhe ge wen ti bai si bu jie, shi zai xiang bu ming bai.
I can't understand this problem no matter how much I think about it.
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这道数学题太难了，我百思不解，只好去请教老师。
zhe dao shu xue ti tai nan le, wo bai si bu jie, zhi hao qu qing jiao lao shi.
This math problem is too difficult, I don't understand it, I have to ask the teacher for help.