carry/take coals to Newcastle
纽卡斯尔是英国的产煤中心和煤输出港口，运煤去此地显然是“徒劳无功”。
to supply something to a place or person that already has a lot of that
particularthing
多此一举;徒劳无功
A:Jane asked me how to solve that problem yesterday.And I gave her the
suggestion.
昨天简问我怎么解决那问题。我给了她点建议。
B:Don't do such a thing again. You just carry coals to Newcastle. She already
has her own ideas. She just pretended to ask you.
下次别干这种事了。你做的事徒劳无益，她已经有了自己的见解。她只是问问你罢了。
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