You can't teach an old dog new tricks .
你很难使因循守旧的人接受新事物。
youdao
You can never teach an old dog new tricks.
你不能使守旧的人接受新事物。
It is: You can't teach an old dog new tricks.
You can't teach an old dog new tricks表面意思是“老狗学不了新把戏”，其实就是指积习难改，固守陈规的人很难接受新鲜事物。
Yet,some people say that you can never teach an old dog new tricks.
VOA: special.2010.05.30
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