For galaxies above a critical size, more than 100 million solar masses of dust can be channelled towards the centre within just 100, 000 years, creating a dense cloud in the centre.

对于星系超过临界大小的星系，超过一亿太阳质量的尘埃可以在仅仅十万年内被引导到中心，在中心产生了高密度的尘埃云。

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And so some people knit together the networks around them, creating a kind of dense web of ties in which they're comfortably embedded.

所以有些人将他们身边的网络们编织在一起，构成了紧密相联的深层网络，而他们则是舒服地身处其中。

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On the first level, in the urban plot, creating a new courtyard of activities, open in a dense historical city center.

第一层，都市情节，面向高密度的历史性城市中心，创建了一个可以容纳各种活动的新庭院。

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These public-private partnerships are obviously built, in part, on tax incentives and government regulations, but they succeed in creating a new social compact by encouraging these dynamic and dense networks.

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