But for a long time past, the study on the river by scholars chiefly focused on the state of its silt, and the changes in its course and irrigation, with little discussion about its appellation.
但是，多年以来，学者们对黄河的研究多集中于黄河的泥沙情况、河道变迁和水利变化等问题，而对黄河名称的由来论述甚少。
The course changes frequently, and the area is so flat that a small change in the level of the river may inundate a considerable area.
河道变化多端，下游地区却很平坦，水位少许上涨河流就会淹没一大片土地。
Major changes in a river course result in both lateral shifts of the old meander belt and in the development of new belts.
河道中大的变动，造成老河曲带的侧向迁移和新河曲带的产生。
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