In recent years, however, the urban environment becomes worse, due to crowded traffic, traffic increased, more and more serious air pollution, atmospheric emissions of many plant makes water pollution is increasingly serious, but nevertheless, a large number of migrant workers are still constantly f

In recent years, however the city environment has changed for the worse, and the result is traffic congestion, air pollution, the greater the traffic flow has become more and more serious, and many factories of atmospheric emissions makes water pollution has become more and more serious, but nonethe

In recent years, however city environment in gradually variations, because the transportation quite is crowded, the traffic flow magnitude enlarge, the air pollution is more and more serious, simultaneously many factory atmospheric emissionses causes the water pollution to be more and more serious,

In recent years, the urban environment gradually worse, however, because of the traffic congestion, traffic volume increased, air pollution is getting worse, at the same time many atmospheric emissions of factories that make water pollution is getting worse, but still, a lot of migrant workers conti

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