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.
据辉瑞公司称，遭质疑的几批奈非那韦的甲基磺酸乙酯或EMS(一种可疑的人类致癌物质)超标。
According to Pfizer, the questionable batches of Viracept contained an unusually high level of the compound ethyl methanesulfonate, or EMS, a suspected human carcinogen.
同时，有没有确凿的证据，但它潜在的健康风险给人类，它被认为是可能的人类致癌物质，由国际癌症研究机构。
While there's no conclusive evidence yet that it has potential health risks to humans, it is considered a probable human carcinogen by the International Agency for Research on Cancer.
讨论了过剩的癌症死亡率，发现在干洗工人暴露于氯乙烯(PCE)的，一种已知的致癌物质，动物和可能存在的人类致癌物质。
Discusses the excess cancer mortality found in dry cleaning workers exposed to perchloroethylene (PCE), a known animal carcinogen and probable human carcinogen.
背景：动物研究发现联氨可能为肺部致癌物质，但人类研究相当少，且局限于癌症死亡率之调查。
Background: Animal studies suggest that hydrazine is a lung carcinogen, but human studies have been rare, rather small, and limited to cancer mortality.
多年以来研究人员猜测，有一种特别的致癌物质是导致人类得肺癌的罪魁祸首。
There is one carcinogen in particular that researchers suspected for years contributed to human lung cancer.
四氯乙烯是已知的致癌物质，在动物和怀疑导致癌症在人类。
PCE is known to cause cancer in animals and is suspected to cause cancer in humans.
亚硝酸盐存在于人类的唾液和某些特定食物保护剂中，它们能转化为致癌物质亚硝胺。亚硝胺主要在酸性环境中形成，例如胃酸条件下。
Nitrosamines are formed in acidic conditions, such as those afforded by stomach acid, but vitamin C inhibits their formation, by converting nitrite to nitric oxide.
亚硝酸盐存在于人类的唾液和某些特定食物保护剂中，它们能转化为致癌物质亚硝胺。亚硝胺主要在酸性环境中形成，例如胃酸条件下。
Nitrosamines are formed in acidic conditions, such as those afforded by stomach acid, but vitamin C inhibits their formation, by converting nitrite to nitric oxide.
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