人满为患 Overcrowding leads to problems
Explanation
指人多得超过了所能容纳的限度，以致造成混乱和不便。
It means that there are so many people that the available space is no longer sufficient, leading to chaos and inconvenience.
Origin Story
话说唐朝时期，长安城是当时世界上最繁华的都市之一。每逢重大节日，来自四面八方的百姓涌入长安城，热闹非凡。然而，长安城虽大，也容纳不下如此众多的人流。街道上人挤人，摩肩接踵，寸步难行。客栈、酒楼更是人满为患，一床难求。不少人露宿街头，苦不堪言。更有甚者，因人潮拥挤，发生踩踏事件，造成人员伤亡。这便是人满为患的真实写照。人们在享受盛世繁华的同时，也深刻地体会到人口众多带来的种种不便和隐患。
It is said that during the Tang Dynasty, Chang'an was one of the most prosperous cities in the world. During major festivals, people from all over the country flocked to Chang'an, creating a lively atmosphere. However, even Chang'an could not accommodate such a large influx of people. The streets were crowded, shoulder to shoulder, and it was difficult to move. Inns and restaurants were overcrowded, and it was difficult to find a bed. Many people slept on the streets, suffering greatly. Even worse, due to the crowded crowds, stampede incidents occurred, resulting in casualties. This is a true portrayal of overcrowding. While people enjoyed the prosperity of the dynasty, they also deeply understood the various inconveniences and hidden dangers brought about by a large population.
Usage
多用于口语，形容人多造成困境。
Mostly used in spoken language to describe the difficulties caused by a large number of people.
Examples
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春运期间，火车站人满为患。
chunyùn qījiān, huǒchē zhàn rén mǎn wéi huàn.
During the Spring Festival travel rush, the train station is overcrowded.
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演唱会当天，体育馆人满为患，气氛热烈。
yǎnchàng huì dāngtiān, tǐyù guǎn rén mǎn wéi huàn, qìfēn rèliè
On the day of the concert, the stadium was packed, and the atmosphere was lively.