be at a loss meaning in Chinese

茫然不知所措

• loss:    n. 1.丧失；丢失，遗失。 2.减 ...
• at a loss:    不知所措，困惑；亏本地; 不知怎办; ...
• for a loss:    处于苦恼中

Examples

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1. I am at a loss respecting his whereabouts .
   关于他的下落，我一无所知。
2. I am at a loss what to do next .
   我不知道下一步怎么办。
3. I am at a loss what to do .
   我就是不知道怎样办才好。
4. I am at a loss for terms adequate to the expression of my gratitude .
   我没有适当的言辞来表达我的感谢。
5. Ross and lady macduff are at a loss as to macduff's flight .
   罗斯和麦克多夫夫人对于麦克多夫的外逃，莫名其妙。