[文法] 關於as的用法

[louvre753 (Solon)]

1. As is expected of professors, I have written quite a bit and conducted
   several research studies.


2. As is the case in most martial arts novels, the story is totally an
   invention of the imagination.


我沒有看過這種句子，請問這兩句as的用法?

謝謝!!! :)

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