Raised body mass index is a major risk factor for heart disease, stroke, type 2 diabetes and other chronic diseases.

升高的身体质量指数是心脏病、中风、2型糖尿病和其它慢性病的一个重要危险因素。

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For example, genes for insulin-like growth factor could enhance muscle mass.

例如，基因对于胰岛素增长因子能够导致肌肉量的增加。

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The other big factor in the sites taking off internationally is simply having a critical mass of users.

让这两个网站走向国际化的另一个重要因素是：拥有大量的用户群。

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Our study indicates that one explanatory factor was whether a country undertook mass privatisation.

ECONOMIST: The British army

It may be that genetic mutations can accumulate without actually leading to a disorder, until, perhaps, they are triggered by an environmental factor or pile up enough to reach a critical mass.

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He's not interested in conforming to a mainstream standard and was hell-bent on avoiding what he called "the karaoke culture" of "American Idol, " "The X Factor" and other programs in which singing is a competition for the mass taste.

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