我们生活在一个多元文化的社会中。
大家都知道，癌变的发生是一个多因素复杂的结合，包括多元的饮食文化，生活方式和环境。
As noted before, carcinogenesis is caused by a complex combination of several factors, including many aspects of culture, lifestyle and environment; not all foods will cause carcinogenesis.
2009年世界上最富有的国家有七分之一的人口生活在贫困线以下，贫困的概念在这就是说如同他们国家一个四口之家的年收入低于二万二千美元（折合一十四万七千多元人民币）。
One in seven people lived below the poverty line in 2009 in the world's richest nation, or on less than $22,000 a year for a family of four.
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