what与as使用方法比较(What seems...is/are...）

What seems to us as bitter trials are often blessings in disguise.

这个我真的不会，就是这一块为何用what 能否详细的讲解一下这个和这个有关的语法

这一块儿的as表示什么意义.

What seems to us as bitter trials are often blessings in disguise.

把介词短语 to us 拿出来。看看句子结构，便一目了然。

What seems as bitter trials are often blessings in disguise.（？）

What seems like bitter trials are often blessings in disguise.（正）

What seems to be bitter trials are often blessings in disguise.（正）

What seems bitter trials are often blessings in disguise.（正）

What 是“融合性关系代词”，等于说：The thing/Anything that...