manifested by 与 manifested as 的区别？

be manifested by 由什么人、方式、渠道体现出来，强调的是体现的方法，后面跟人物、代词、动词分词或者way(方式）

be manifested as 被体现成什么事物，强调的是体现的结果,后面跟名词或者名词短语。

friendship is manifested by helping each other in difficulties.

friendship is manifested as care, sympathy and support.

friendship is manifested as care, sympathy and support by helping each other in difficulties