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- 这使他完全茫然（而语塞）了。
It left him at a complete loss (for words).
- 大家对她的解释茫然不解。
Her explanations were met with blank incomprehension.
- 如果让他谈谈艺术，他就茫然不知了。
If you get him talking on art, he soon gets out of his depth.
- 她彷佛茫然不知身在何处，犹犹豫豫向四周打量。
As if unsure of where she was, she hesitated and looked round.
- 她茫然地看着我们。
She looked at us in perplexity.
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