1. The size and location of the deltas were controlled by distributary watercourses. 分流河道发育情况控制了三角洲朵体的大小和位置。
2. He loved to run down dry watercourses, and creep and spy upon the bird life in the woods. 他喜欢沿着干枯的河道前行，蹑手蹑脚地在树林中观察鸟儿的生活。
3. This often results in huge holes in the ground, noxious spoil-heaps and polluted watercourses. 这常常会在地面上留下一个个巨大的坑，有毒的矸子山和污染的河道。
4. Much is washed off by rain, ending up in local watercourses where dissolved nutrients can cause algal blooms and kill fish. 大部分是被雨水冲走，沉积在当地河道并在那里溶解成营养素，这种营养素能引起当地藻类大量繁殖并造成鱼类死亡。
5. The river was harnessed at last, and the floodwaters poured safely into the sea through the watercourses they had dredged. 八年之中，大禹三过家门而不入，终于疏通了河道，使洪水流进了大海。
