A survey shows that the average life expectancy of people living in cities with little or no pollution is far longer than those in heavily polluted areas.
一项调查表明，居住在没有或几乎没有污染的城市，居民平均寿命远高于污染严重地区的居民。
The results of statistical analysis indicate that the west and north areas of the lake are heavily polluted, while it is averagely polluted in the south area.
数据统计分析结果表明湖区的西部与北部为重度污染，南部为中度污染，东部的污染程度介于上述两者之间。
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