做徒劳多余的事;井边挑水井边卖;徒劳无益;
Don't carry coals to Newcastle.
别往纽卡斯尔(英煤都)运煤。/多此一举,徒劳无益。
To carry coals to Newcastle.
运煤到纽卡索,多此一举。
To offer him money is to carry coals to Newcastle; he is very wealthy.
给他钱是多此一举, 因为他已经很富有了.
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