HSK 7-9
独一无二
dúyī-wú’èr(idiom) unique; unmatched; unrivalled
每个人都有独一无二的经历。
Měi gè rén dōu yǒu dú yī wú èr de jīng lì.
Every person has a unique experience.
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Appears across levels (7-9) in the HSK 3.0 word list.