降水是人人皆晓的自然现象，但同样是降水，降水的类型却并不都一样。地形雨暖湿气流前进时，受到山地的阻挡，沿着山坡上升，在上升的过程中，气温不断下降，气流携带的水汽遇冷成云降雨，这种在迎风山坡的降水，称地形雨。（见第一册教材５６页地形雨示意图）一般说来，... Precipitation is a natural phenomenon that everyone knows, but it is also precipitation. The types of precipitation are not all the same. When the topography of rain and warm wetlands is moving forward, it is blocked by mountains and rises along the slopes. During the ascent, the temperature keeps dropping, and the water vapor carried by the airstream is cooled down into clouds. This kind of precipitation on the windward slopes is called topographic rain. (See the first page of the 56-sheet map of the terrain.) In general,...