1. at a loss : 困惑, 不知所措；
名词
1. He suffered a temporary loss of memory.
他暂时丧失了记忆。
2. When heavy atoms are split in this way some loss of mass occurs.
当重原子这样被分裂的时候，就会发生质量的减少。
3. The loss of my watch meant that I had to buy a new one.
我的手表丢了就意味着我得买只新的。
4.
4. His unfortunate death was a great loss to the firm.
他的不幸去世对他的商行来说是个重大损失。
5. Their company suffered loss on loss in business last year.
他们公司去年在生意上接二连三地亏本。