名词
中文翻译：黑市交易
同义词：
['unregulated market exchange', 'illicit market exchange']
例句：
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1. The black market exchange of illegal drugs is a major concern for law enforcement.
非法药物的黑市交易是执法部门的一个主要关切。
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2. The government has been trying to regulate the black market exchange of firearms.
政府一直在试图对枪支的黑市交易进行管制。
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3. Many people use the black market exchange to buy and sell goods that are not available in the official market.
许多人通过黑市交易购买和出售官方市场没有的商品。