HSK 7-9
谜团
mítuán名
riddle; enigma; unpredictable situation; elusive matters
新证据让这个谜团更加复杂。
Xīn zhèngjù ràng zhège mítuán gèngjiā fùzá.
The new evidence made the mystery even more complicated.
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Appears across levels (7-9) in the HSK 3.0 word list.