HSK 7-9
孪生
luánshēng形
(adj.) twin
这对孪生姐妹性格完全不同。
Zhè duì luánshēngjiěmèi xìnggé wánquán bùtóng.
The twin sisters could not be more different in temperament.
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Appears across levels (7-9) in the HSK 3.0 word list.