The World Health Organization has listed indoor air pollution as one of five environment factors that badly endanger the public health.

室内空气污染已被世界卫生组织列为对公众健康危害最大的五种环境因素之一。

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Weather within a given region occurs in such a complex and unstable environment, driven by such a multitude of factors that no single weather event can be pinned solely on climate change.

如果一个特定区域里的气候呈现出如此复杂而易变的天气环境，又被如此众多的因素驱动着，那就没有哪一种天气事件能归结于天气变化。

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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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But as these organizations move to cloud-centric IT models, there are real-world business needs and other factors that make operating a single environment not practical.

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In addition, as far as the prenatal environment per hormonal influences, there is some evidence that sexual, physical or verbal abuse could be factors rising to the level of stress that might alter the hormonal prenatal environment, leading to problems in neurodevelopment.

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"There are likely to be many factors to do with our environment and our health that might increase our risk of developing cancer, " he said.

BBC: NEWS | Health | Pregnancy disorder link to cancer