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你听说过湿地吗?它是陆地和水域之间的过渡地带,如沼泽、湖泊、池塘、河流等。在流域中,湿地有着很重要的作用!不信?我们来试试看。你需要:浅托盘,大海绵(与托盘同宽),土,一杯水,勺子,空杯子。第一步:把海绵放在托盘一侧,确保托盘被海绵填满。第二步:在水里倒一勺土,搅拌。第三步:将泥水轻轻地倒在海绵上。把托盘倾斜,让水从海绵里流出来,流到托盘另一端。第四步:把从海绵里流出来的水倒进空杯子里。从海绵里流出的水是不是比较干净呢?为什么会这样?
Have you ever heard of wetlands? It is a transition zone between land and water, such as swamps, lakes, ponds, rivers, etc. Wetlands play an important role in the watershed! Do not believe? Let’s try. You need: shallow tray, large sponge (the same width as the tray), soil, a glass of water, a spoon, an empty glass. The first step: the sponge on the side of the tray to ensure that the tray is filled sponge. Step two: pour a spoonful of soil in the water, stirring. The third step: gently pour the mud on the sponge. Tilt the tray, allowing water to flow from the sponge to the other end of the tray. Step 4: Pour water out of the sponge into the empty glass. Is the water flowing out of the sponge cleaner? Why is it so?