山体细粒沉淀物在冰川与河流活动的作用下被冲刷下来，接着被风吹走或水流带走。
The actions of glaciers and rivers scrape away fine sediment, which is carried away by water and wind.
当人们在沿着萨那加河和其他的河流活动（想不出更好的词）时，传染病毒便向周遍地区蔓延开来。
The infection could have crossed borders as people traveled along the Sanaga River and other waterways.
该国在水源领域的活动过于频繁，不仅国内如此，国外亦然——在非洲和巴基斯坦建设水坝、在莫桑比克和菲律宾寻找土地、为一己用途使河流改道。
It is hyperactive in the world of water, not only at home but abroad-building DAMS in Africa and Pakistan, looking for land in Mozambique and the Philippines, diverting rivers for its own purposes.
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