风雨不透 windproof and waterproof
Explanation
形容封闭或包围得十分紧密，风雨都透不进来。比喻人多拥挤，毫无缝隙。
Describes something completely enclosed or surrounded, so that neither wind nor rain can penetrate. Illustrates a dense crowd without gaps.
Origin Story
古时候，在一个偏僻的小村庄里，住着一户人家，他们家境贫寒，住的是一间破旧的小屋。每当刮风下雨的时候，屋里就会漏水，日子过得很是艰辛。有一天，村里来了一个工匠，他看到这户人家的窘境，便主动提出要帮他们修缮房屋。工匠心灵手巧，他用了几天时间，把房屋修缮一新。房屋的墙壁加固了，屋顶也补好了，从此以后，无论刮风下雨，屋里都干干净净，风雨不透。这户人家感激不尽，从此过上了安居乐业的生活。
Once upon a time, in a remote village, lived a poor family in a dilapidated house. Every time the wind blew and the rain fell, the house would leak, and their life was very difficult. One day, a craftsman came to the village, he saw the plight of this family, and volunteered to help them repair their house. The craftsman was skillful, and he spent several days repairing the house. The walls of the house were reinforced, and the roof was repaired. From then on, no matter how windy or rainy it was, the house was clean and dry, and wind and rain could not penetrate. The family was grateful and lived a peaceful and happy life from then on.
Usage
作状语、定语；形容封闭或包围得十分紧密。
As adverbial or attributive; Describes something completely enclosed or surrounded.
Examples
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会议室里人山人海，风雨不透。
huiyishi li ren shan ren hai, fengyu butou
The meeting room was packed, airtight.
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暴雨倾盆，大家躲在帐篷里，风雨不透。
baoyu qingpen, da jia duo zai zhangpeng li, fengyu butou
The rain poured down, everyone hid in a waterproof tent, completely sheltered from the elements.