But if you do not look at grasslands but look down into them, you find that most of the soil in that grassland that you've just seen is bare and covered with a crust of algae, leading to increased runoff and evaporation.
但如果你不是远远的看，而是看草地的土壤表面， 你会发现草地里大部分的土壤表面 都是光秃秃的，只有很少的藻类覆盖在上面， 这导致了水分的流失和蒸发。