释义
puzzled or uncertain what to think, say, or do
不知所措[with infinitive]
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she became popular, and was at a loss to know why 她变得颇受欢迎，却不知为何如此
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he was at a loss for words. 他不知该说些什么。
making less money than is spent buying, operating, or producing something
亏本地
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a railway running at a loss .亏损经营的铁路。