to glare
mouth
fool
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dumbstruck
stupefied, dumbfounded
他們 看到 奇怪 的 東西， 全部 目瞪口呆。
They saw something strange and were all dumbstruck.
我 聽到 他 的 話， 當場 目瞪口呆。
I was dumbstruck when I heard what he said.
這麼 大 的 變化 讓 我們 目瞪口呆。
We were dumbstruck by such a big change.