Practice 3　　蓝藻是一种简单的水生植物，它可以在河湖、湿地、树干和温泉自然蔓延生长。当蓝藻细胞达到一定程度时，蓝藻的“密集孽生”会使水体变色、引起泡沫、散发臭气、影响贝类和鱼类的生存，还会使水质大幅度下降。　　2007年夏天，富营养物和其他污染导致蓝藻在太湖、巢湖、滇池发生了蓝藻“密集孽生”现象，影响了城市供水及水生产品生长。　　“密集孽生”最严重的是太湖东部。太湖是我国第三大淡水湖。这次“密集孽生”导致周边100多万居民供水问题长达10天之久。为了防止污染，当地环保部门关闭了770家化工厂。　　2008年夏天，长期的温暖、干燥气候导致蓝藻在部分地区发生。9月，一艘可以快速、有效地清除蓝藻的船在江苏省投入使用。

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【参考译文】
Blue-green algae is a simple aquatic plant that grows naturally in rivers, lakes, wetlands, tree trunks and hot springs. When the number of algae cells increases to a certain level, the bloom of the plant can discolor river and lake water, form scum, produce unpleasant odors, make shellfish and fish unable to survive and seriously lower the water quality.
In the summer of 2007, nutrient runoff and other pollutants caused blue-green algae to bloom in Taihu, Chaohu and Dianchi lakes, endangering water supplies for nearby cities and threatening aquatic life in these lakes.
Taihu, the country’s third largest freshwater lake, swathe worst algae outbreak in its eastern part. This makes tap water undrinkable for more than 1 million local residents for about 10 days. The local environmental protection authorities shut down 770 chemical plants around the lake to curb the pollution.
In the summer of 2008, due to a long spell of warm, dry weather, blue-green algae broke out again in some lakes. In September, a blue-green algae-clearing vessel was put into use in Jiangsu Province. It can effectively eliminate the plant in a short period of time.

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