The coloring material results from contact of the water with organic debris, such as leaves, needles of conifers and wood, an in various stage of decomposition.
英
美
- 着色物质是由水与有机残渣,如树叶、针叶树的针叶和木材,以及所有这些物质在各个阶段的分解产物相接触而产生的。