opacity /əʊˈpæsɪtɪ/

• 1. 

  N-UNCOUNT Opacity is the quality of being difficult to see through. 不透明性 [正式]

  例：

  Opacity of the eye lens can be induced by deficiency of certain vitamins.

  眼球晶状体的混浊可由缺乏某些维生素引起。

• 2. 

  N-UNCOUNT If you refer to something's opacity, you mean that it is difficult to understand. 晦涩难懂 [正式]

  例：

  ...a stupefying verbal opacity.

  ... 让人惊讶的晦涩难懂的语言。