"犀牛角过去一直作为自然历史销售品出现在伦敦"，martin说，"这之前，它的价格一直很低，而现在，黑犀牛角的价格达到10万美元一对。"

"Horns have been appearing in London at these natural history sales," says Martin, "and before, the price used to be quite low.And now, they're paying up to a $100,000 for a pair of black rhino horns.

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