perplexity

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. 他開(kāi)始數(shù)，然后更加困惑地?cái)?shù)第二遍。

2. N-COUNT The perplexities of something are those things about it that are difficult to understand because they are complicated. 疑難問(wèn)題[usu pl]

...the perplexities of quantum mechanics. ...量子力學(xué)難題。