较差的卫生条件也大大加重了水污染， 从而增加了家庭的安全饮用水费用，降低了河湖渔业产量。
Poor sanitation also contributes significantly to water pollution—adding to the cost of safe freshwater for households, and reducing the production of fish in rivers and lakes.
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.
该系统的研制成功为城市河湖的污染治理开辟了新途径。
The successful development of the system has broken a new path for the pollution control of rivers and lakes in urban areas.
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