Thirdly, in view of spatial hierarchy, urban recreation space always includes four classes: block recreation, community recreation, district recreation and urban recreation.

从空间层次上来看，城市游憩空间一般来说包括四个层级，即小区游憩、社区游憩、城区游憩和城市游憩；

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Without this approach, groupthink, overly vocal members or real or perceived hierarchy will suppress (production block) the most promising out of the box ideas.

FORBES: When Innovation Fails