Staring blankly with mouth agape, unable to speak due to extreme shock, astonishment, or surprise.
听到老师宣布比赛结果，同学们都惊得目瞪口哆，没想到会是这样的结局。
Upon hearing the teacher announce the competition results, all the students were dumbfounded, staring blankly with their mouths agape, having not expected such an outcome.
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