To be wide-eyed and tongue-tied; to be dumbfounded or astounded; struck speechless with astonishment or shock.
当老师宣布他的画作获得了第一名时，他惊讶得瞪目结舌，久久说不出话来。
When the teacher announced that his painting won first place, he was so astonished that he became wide-eyed and speechless for a long time.
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