求翻译：国内外医学界已经证实，人类80%～90%以上的癌症与外部环境因素相关，也就是人类生活环境中的物理、化学和生物因素与癌症的发生密切相关。是什么意思？

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The medical profession has both at home and abroad has confirmed that 80 per cent of mankind - more than 90 per cent of the cancer and the external environment that is associated in the living environment of the physical, chemical and biological factors and cancer of the closely related.

The domestic and foreign medical arenas already confirmed that, human 80%~90% above cancer and the external environment factor are related, also was in humanity living conditions physics, chemistry and the biotic factor and the cancer occurrence close correlation.

Medical sector at home and abroad have confirmed that more than human 80%~90% cancer associated with external environmental factors, namely the human living environment of physical, chemical, and biological factors associated with cancer.

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