短语
中文翻译：不知所措
同义词：
['stumped', 'at a loss例句：1. He was at a nonplus when the teacher asked him to explain the concept.（当老师问他解释这个概念时，他感到不知所措。）2. The presentation went well until she realized she had forgotten her notes at a nonplus.（演讲进行得很顺利，直到她意识到自己忘记了笔记，这让她措手不及。）']
例句：
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1. He was at a nonplus when the teacher asked him to explain the concept.
当老师问他解释这个概念时，他感到不知所措。
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2. The presentation went well until she realized she had forgotten her notes at a nonplus.
演讲进行得很顺利，直到她意识到自己忘记了笔记，这让她措手不及。
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3. She was at a nonplus when she realized she had left her phone at home.
当她意识到她把手机落在了家里时，她感到非常困惑。