Furthermore, each part of a single river system is interrelated, requiring the tracking of pollutants to their sources and integrated planning; the treatment cannot be piecemeal, or the work will be fruitless.
而同一河系內各部分互相牽連，必須對汙染追本溯源，整體規劃；不能頭痛醫頭、腳痛醫腳，以致徒勞無功。