Crossroads are the main distributing centre of traffic and the cause for the urban crowding.

交叉口是城市交通的主要集散地，是交通拥挤产生的主要环节。

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Urban crowding under unsanitary conditions also creates ideal conditions for explosive epidemics of well-known diseases, such as yellow fever and dengue.

城市人满为患，卫生条件恶劣，也为一些众所周知的疾病，例如黄热病和登革热的爆炸性流行创造了理想条件。

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Penturbia asserted that high costs and urban crowding would drive the middle class out of cities and suburbs.

FORBES: Life 2.0

It was urban crowding that made the bacterium so successful and so virulent.

WSJ: Matt Ridley on Infectious Diseases and Standards of Living | Mind & Matter

Without money or resources, climate refugees will likely stay within their own borders, accelerating movement from rural areas to urban centers and crowding into cities already bursting at the seams.

CNN: Climate change may displace up to 200 million