名词
中文翻译：中间商
同义词：
['trader', 'merchant', 'broker']
例句：
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1. The smuggler was caught red-handed by the police.
走私者被警察当场抓获。
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2. He is a professional trader in the stock market.
他是股市的一名专业交易员。
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3. They were buying and selling goods on the black market.
他们在黑市上买卖商品。