For a long period, the industrial and city sewage were over-discharged along the Yangtze River, which would no doubt have harmful effect in estuary environment either directly or indirectly.
长期以来，长江流域的工农业及城市生活排污一直没有得到有效的控制，这必将对下游河口地区的生态环境造成直接或潜在的威胁。
During the 1990s, this river discharged over 100 million pounds of toxics downriver each year.
20世纪90年代，这条河每年向下游排放超过1亿磅的有毒物质。
More than 30 million tons of waste rock are spread over the surrounding areas, and untreated water is discharged by the mines into the river.
超过3千万吨的废矿石遍布四周，未处理的水从矿井直接排入河中。
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