Relation between the equivalent mass factor of structure and periods of structures on different sites.

结构等效质量系数与场地和结构周期的关系。

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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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Another factor was the rise of processed foods and, with the invention of the steel roller mill in the late 19th century, the possibility of mass-marketing those foods.

另一个原因是加工食品的增多，并且，由于19世纪末钢滚轮面粉厂的出现，为这类加工食品的大批量生产提供了条件。

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