Modern China suffered greatly from foreign aggression, and countless patriots rose up to save the nation.
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The idea goes back to the Book of Songs poem 《常棣》, usually quoted as 兄弟阋于墙，外御其侮 (brothers may quarrel inside the walls, but together they fight off insult from outside). 侮 is 'to insult, to bully', as in 侮辱 (to humiliate).
