manifested by 與 manifested as 的區別？

be manifested by 由什麽人、方式、渠道體現出來，強調的是體現的方法，後面跟人物、代詞、動詞分詞或者way(方式）

be manifested as 被體現成什麽事物，強調的是體現的結果,後面跟名詞或者名詞短語。

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