Recently fish populations have recovered as releaseof industrial pollutants has declined and the lake's waters have become cleaner.
最近，随着工业污染物排放的减少和湖水的清洁，鱼类数量有所恢复。
2
Although treatment and disposal of health-care waste reduces risks, indirect health risks may occur through the releaseof toxic pollutants into the environment through treatment or disposal.