英语口语：江山易改本性难移

A fox may grow gray, but never good.

狐狸有可能会变灰，但绝不会变好。

gray 灰色的 grow gray 变灰

A leopard can't change its spots.

豹子不能去掉它身上的斑点。

leopard 豹子，美洲豹 spot 斑点

You cannot make a crab walk straight.

你不能让螃蟹竖着走路。

crab 螃蟹

old habits die hard

积习难改

He's taken up smoking again. You know he had quit for about a year, but Iguess old habits die hard.

他又开始抽烟了，之前他已经戒烟大约一年多了，可能还是积习难改吧。