The major differentiation among social classes within the culture of Russian dance took place as a historical event.

在俄罗斯舞蹈文化中，社会阶层之间的主要区别作为一个历史事件而发生。

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And 7 to 9 months, the three major insurance premium income rate of emergence of differentiation.

和第7至9个月，三大保险公司保费的收益率出现分化。

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This is the major basis of differentiation between a road bike and a mountain bike.

这是主要依据的分化之间的公路自行车和山地自行车。

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However, the development of reproducible methods to control stem cell growth and differentiation is still a challenge and major studies are needed before stem cells can be widely used for therapeutic purposes.

UNESCO: 2010 UK and Ireland Winners