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It is a Chinese idiom, w è IR é nzu à Ji à. The original meaning is that the daughter of a poor family has no money to buy wedding clothes, but every year she works hard to embroider with gold thread to make wedding clothes for others. It's a metaphor for Kong working hard for others. From poor girl.
The origin of Idioms
In the poem "poor girl" written by Qin Taoyu of Tang Dynasty, "hardship means pressing the golden thread every year and making wedding clothes for others."
Idiom usage
It's more formal; it's a predicate; it's used to describe working for others.
Examples
Why marry? But since I came to Beijing, no one knows. Today, you make an exception for fear that you will be entangled in the future. The 95th chapter of Cao Xueqin's dream of Red Mansions in Qing Dynasty
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Clams become pearls from diseases - bàng bìng chéng zhū
All dogs and chickens are immortal - jī quǎn jiē xiān
be in harmony with the rest of the world - hùn sú hé guāng