EPA的科学咨询委员会已确定氯乙烯作为一个可能的，以可能的人类致癌物质。

EPA's Science Advisory Board has identified perchloroethylene as a possible to probable human carcinogen.

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但几乎同时，该局的一个咨询委员会就对此结论及其科学依据提出了尖锐的质疑。

But almost immediately, one of the FDA's advisory committees sharply questioned the conclusion and the science behind it.

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但几乎同时，该局的一个咨询委员会就对此结论及其科学依据提出了尖锐的质疑。

But almost immediately, one of the FDA's advisory committees sharply questioned the conclusion and the science behind it.

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