There are many colleges and research institutes in the higher education cultural district, where the population density is high and the impact of the environmental pollution is wide.
高教文化区是一个城市的特定区域，区域聚集多所大中专院校和科研院所，人口密度大，环境污染影响范围广。
The grave issues involved in the current environmental dilemma include high population density, environmental pollution, an overabundant of silt in rivers and lakes, and the frequency of disasters.
但当前这一地区环境问题并不理想，人口密集、环境污染、河湖淤浅、灾害频发等矛盾比较突出。
The grave issues involved in the current environmental dilemma include high population density, environmental pollution, an overabundant of silt in rivers and lakes, and the frequency of disasters.
但当前这一地区环境问题并不理想，人口密集、环境污染、河湖淤浅、灾害频发等矛盾比较突出。
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