以后 vs 后来

以后 anchors "after" to a point, future included (穿好衣服以后); 后来 is "later on" in a past story and stands alone (但后来忘了).

以后以後

yǐhòu ㄧˇ ㄏㄡˋ

after; later; afterwards

我穿好衣服以后就吃早饭。

After I get dressed, I eat breakfast.

后来後來

hòulái ㄏㄡˋ ㄌㄞˊ

afterwards; later; newly arrived

后来我明白北京人走路走得慢。

I later realized that Beijing people walk slowly.

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