A fox may grow gray, but never good.
gray 灰色的 grow gray 变灰
A leopard can't change its spots.
leopard 豹子,美洲豹 spot 斑点
You cannot make a crab walk straight。
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 I guess 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。
Muisc: Vienna Teng——The Tower
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