他们知道水是向下流的，还会自己保持水平。
They knew that water flowed downhill and would rise to seek its own level.
道路行驶也依然很危险，因为水继续从山上向下流，有时还发生小型的山体滑坡。
Road travel is also still dangerous as water continues to flow down from mountains, while minor landslides occur from time to time.
向下流动是一根不断缩短的导火线，将产生深远的影响。
Downward mobility is an ever-shortening fuse leading to profound consequences.
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