1000 below the carcinogenic potency of aflatoxin B~ and a factor of ten below the potency of vinyl chloride.的翻译：什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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1000以下的黄曲霉毒素的致癌药性B?和氯乙烯的效力低于10倍。

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