Pushed by rural poverty, pulled by the hope of a better life in the cities, tens of millions of country people uproot themselves every year to join the swelling urban slums31.

• 受农村贫困状况的驱使，抱着到城市过较好生活的希望，每年都有成百万的农民背井离乡住进人满为患的城市贫民窟。