HSK 7-9
繁衍
fányǎn动
to multiply; to reproduce; to increase gradually in number or quantity
这种动物在湿地大量繁衍。
Zhè zhǒng dòng wù zài shī dì dà liàng fán yǎn.
This animal reproduces in large numbers in the wetlands.
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Appears across levels (7-9) in the HSK 3.0 word list.