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。
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。
In the online game industry the product life cycle is short, the external environment would change quickly, these characteristics cause that the risk of the online game industry continue to increase.
网络游戏产业中产品生命周期较短，外部环境变化快的特点导致网络游戏产业的风险还将继续增加。
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