be agape and tongue-tied;be at a loss for words;be stumped by ...;be unable to find anything to say;see a wolf;

He was stumped by the questions and remained tongue-tied for a good while.
他被问得张口结舌,半天说不出话来.
来源:《现代汉英综合大词典》Meeting strangers embarrassed the boy so much that he blushed and stammered.
那男孩在生人面前显得局促不安,以致面红耳赤,张口结舌.
来源:互联网摘选Brought before the evidence of his crimes, he was awe-struck and could say nothing in his defence.
罪证俱在, 他张口结舌,无言以对.
来源:《现代汉英综合大词典》
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