impenetrable /ɪmˈpɛnɪtrəbəl/ TEM8

• 1. 

  ADJ If you describe something such as a barrier or a forest as impenetrable, you mean that it is impossible or very difficult to get through. (障碍或森林等) 难以穿越的

  例：

  ...the Caucasus range, an almost impenetrable barrier between Europe and Asia.

  …高加索山脉，欧亚之间一道几乎不可逾越的屏障。

• 2. 

  ADJ If you describe something such as a book or a theory as impenetrable, you are emphasizing that it is impossible or very difficult to understand. 不能理解的 [强调]

  例：

  His philosophical work is notoriously impenetrable.

  他的哲学著作是出了名地令人费解。