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trade in

动词
  1. To give a piece of merchandise as part of the payment or trade for something new.
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Sir William Lucas had been formerly in trade in Meryton, where he had made a tolerable fortune, and risen to the honour of knighthood by an address to the king during his mayoralty.
《Pride and Prejudice》,第17页 · B2
A CHARCOAL-BURNER carried on his trade in his own house.
《Three Hundred Aesop's Fables》,第5页 · B2

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