perplexity

柯林斯词典

1. N-UNCOUNT Perplexity is a feeling of being confused and frustrated because you do not understand something. 困惑; 迷惘
He began counting them and then, with growing perplexity, counted them a second time. 他开始数，然后更加困惑地数第二遍。
2. N-COUNT The perplexities of something are those things about it that are difficult to understand because they are complicated. 疑难问题[usu pl]
...the perplexities of quantum mechanics. ...量子力学难题。