be at a loss

基本解释

We never seemed to be at a loss for things that we enjoyed doing together.
好像从来没有什么事我们不喜欢一起做的。
Employees in DC schemes can be at a loss when deciding how much to invest, where to put their money and what kind of pension to expect.
在DC计划中，雇员在决定投入多少额度以及需要哪种养老金时茫然不知。
Some days in the course of our lessons he would suddenly be at a loss for some word and look vacant and ashamed.
有几天在上课期间，他忽然一下子记不起一些字句，茫然地露出愧色。

And if you were suddenly stripped of your ability to make generalizations, you'd be at a loss.
如果你突然失去了,归纳的能力，你就会一头无绪。
耶鲁公开课 - 心理学导论课程节选
It comes from personal experience that raises a question at least about whether all values can be translated without loss into utilitarian terms.
是亲身见闻所引起的疑问,是否所有的价值都可以完好无损地,转换为功利主义的形式。
耶鲁公开课 - 公正课程节选
The abandonment of such a study or its adulteration for current political purposes would be a terrible loss for all of humanity, and at the base, at the root of that civilization stood the Greeks.
如果出于政治的目的而对此段历史,视而不见甚至完全摒弃,这对全人类,将是一个巨大的损失,追根溯源,这一切都根植于希腊文明
耶鲁公开课 - 古希腊历史简介课程节选

If these guys weren't building high performance networks we'd be at a loss.
FORBES: Consortium Builds Next-Generation Net