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。
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。
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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