一种使大鼠和小鼠致癌的化学物质，后来发现可减少人类某些癌症的大小，数年后该作用又被证明无效。
A chemical found to cause cancer in rats and mice was later found to reduce the size of some cancers in humans, years after it had been deemed useless.
再生水深度处理工艺对降低化学致癌物和非致癌物的终生健康风险具有明显作用。
There were obvious effects of reclaimed water advanced treatment process to reduce lifetime health risks of carcinogens and non-carcinogens.
再生水深度处理工艺对降低化学致癌物和非致癌物的终生健康风险具有明显作用。
There were obvious effects of reclaimed water advanced treatment process to reduce lifetime health risks of carcinogens and non-carcinogens.
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