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由于我们知识的严重缺乏,一直妨碍着为进行调查研究和控制现代癌症流行所作的努力,而这种知识的缺乏在近期内还不可能得到克服。例如,在氯化消毒水中存在的某些有机化合物,在动物身上一直显示有致癌作用,尽管这个观文为推断到人提供了基础,也为以整个人群为基础的流行病学调查提供了线索,然而,在目前这些研究途径都不能为制定具有重要意义的法规提供充分的证据。
Due to the serious lack of our knowledge, there has been a hurdle of efforts to conduct investigations and to control the epidemic of modern cancer, and this lack of knowledge is unlikely to be overcome in the near future. For example, certain organic compounds present in chlorinated water have been shown to have oncogenic effects in animals, although this observation provides a clue to infer the human being and provides a clues to an overall population-based epidemiological investigation However, at present, none of these research approaches can provide sufficient evidence for the formulation of laws of great significance.