HSK 7-9
亲生
qīnshēng形
one's own (child) (i.e. one's child by birth); biological (parents); birth (parents)
她终于找到自己的亲生父母。
Tā zhōngyú zhǎodào zìjǐ de qīnshēng fùmǔ.
She finally found her biological parents.
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Appears across levels (7-9) in the HSK 3.0 word list.