The mixed mode of urban library service system includes central-branch library and alliance mode. Because central-branch library and alliance are different, we should adopt different tactics to them.

城市图书馆服务体系混合模式包含总分馆制和联盟模式，采用混合模式是城市图书馆服务体系的需要，因总分馆制和联盟模式的差异，应对总分馆制和联盟模式采用区别策略。

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The NDP was born in 1961 as an uneasy alliance of prairie populists and urban trade unionists.

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Of the approximately 5, 000 charter schools nationwide, only about 20% are in the suburbs, while 51% are in urban areas, according to the National Alliance for Public Charter Schools.

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