So when the evolution progress becomes drastic, the urban structure must begin to revolution.

当城市演进过程超常规时，城市空间结构也会发生激烈的变异。

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The result was an urban revolution: the murder rate fell by 67%, tourists returned and the private sector boomed.

ECONOMIST: Lexington

The most successful example of this case in recent years is the Low-Income Housing Tax Credit (LIHTC), the 1986 provision to the federal tax code that sparked a revolution in urban redevelopment and resulted in an upsurge of new organizations and activities to promote the development of low-income housing.

FORBES: For the 21st Century, a Network of Beneficial Philanthropy and Corporate Citizenship

Will Allen, an urban farmer and MacArthur fellow, is the author with Charles Wilson of The Good Food Revolution , a new book published by Gotham.

FORBES: The New Green Revolution: A Vision For Small-Scale Urban Farming