External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.

外部环境致癌因素是指环境中导致罹患癌症的危险升高的因素，如空气污染、紫外线辐射及室内的氡等。

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External environmental causes of cancer are factors in the environment such as pollutants that increase risk for cancer.

外部环境致癌因素是指环境中的污染物等导致罹患癌症的危险升高的因素。

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Cancer data may point to environmental risk factors or high risk behaviors, so preventive measures can be taken to reduce the number of cancer cases and resulting deaths.

癌症数据可能定位环境危险因素或者高危行为，因此预防措施可以降低癌症发生和导致死亡的数量。

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We must be extra vigilant, The government must play its role as to make the environment safe and remove all environmental factors cancer. (OMITTED) Good sources of drinking water, he says,will stop people from going to streams and ponds, where they get infected with some of these organisms.

VOA: standard.2010.06.16

The Institute of Medicine (IOM) has just released a large-scale report reviewing the evidence for the role of certain lifestyle variables and environmental factors in breast cancer risk.

FORBES: Environmental Risks For Breast Cancer: What You Need To Know

Enhanced investments would facilitate sustained coordination across research and regulatory agencies with the objective of reducing or eliminating harmful environmental exposures and modifying social and lifestyle factors implicated in breast cancer.

FORBES: New Government Breast Cancer Report Calls for Focus on Prevention, Study of Environmental Risk Factors