People who are not blood relatives but share a deep, familial bond, treating each other as if they were siblings by blood.
尽管他们没有血缘关系，但从小一起长大，情同手足，真是异姓骨肉。
Although they are not related by blood, they grew up together and share a bond as strong as siblings, truly like family despite their different surnames.
Era:
Ancient
Frequency:
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