What are occupational and environmental causes of cancer?
癌症的职业和环境原因是什么？
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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.