Dredging the river aims at keeping the river course smooth and water clean.
清挖河道是为了保持河道畅通，河水清洁。
Therefore, dredging of sediment will improve greatly water quality of the river.
因此，对淤泥进行清淤将会大大提高河道的水质。
We're dredging (up) mud (from the river bed).
我们正在(从河床)挖淤泥。
We're dredging (up) mud (from the river bed).
我们正在(从河床)挖淤泥。
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