患难之交 friend in need
Explanation
患难之交指的是那些在经历过艰难困苦后仍然保持友谊的朋友。他们之间的友谊经过风雨的考验，更加深厚和珍贵。
A friend in need is a friend indeed, who shares difficulties in life and whose friendship is strengthened through hardship.
Origin Story
唐朝诗人柳宗元和刘禹锡是挚友。柳宗元被贬永州，刘禹锡被贬朗州，两人在贬谪途中互相慰藉，诗词唱和，他们的友谊在逆境中更加深厚。后来，刘禹锡被调往更加危险的地区任职，柳宗元为了朋友的安全，主动请求与他调换职位，体现了患难之交的真挚情谊。
The Tang Dynasty poets Liu Zongyuan and Liu Yuxi were close friends. Liu Zongyuan was exiled to Yongzhou, and Liu Yuxi was exiled to Langzhou. During their exile, they consoled each other, exchanged poems and songs, and their friendship deepened in adversity. Later, Liu Yuxi was transferred to a more dangerous area. To ensure his friend's safety, Liu Zongyuan volunteered to switch positions with him, demonstrating the true friendship in adversity.
Usage
用来形容在困境中结成的深厚友谊。
Used to describe a deep friendship formed in the midst of difficulties.
Examples
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患难见真情，他是我患难之交。
huan nan jian zhen qing, ta shi wo huan nan zhi jiao
Adversity reveals true friendship, he is my friend in need.
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李白和杜甫是患难之交，他们的友谊千古流芳。
li bai he du fu shi huan nan zhi jiao, tamen de you yi qian gu liu fang
Li Bai and Du Fu were friends in need, their friendship is immortalized.