HSK 7-9
目瞪口呆
mùdèng-kǒudāi(idiom) dumbstruck; stupefied; stunned
这个结果让所有人目瞪口呆。
Zhège jiéguǒ ràng suǒyǒurén mùdèngkǒudāi.
This result left everyone stunned.
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Appears across levels (7-9) in the HSK 3.0 word list.