2. Thus the farmer is helping nature rebuild the
topsoil that holds the rain, resists the wind and provides food for growing plants.
因此，农民是协助大自然重建能够存蓄雨水、抵抗风力和滋养各种植物的表面土壤。
3. In the absence of successful efforts to stem the loss of
topsoil, the social effects of erosion will probably first be seen in Africa.
在控制表土流失的努力缺乏成效的情况下，土壤侵蚀的社会影响将可能首先出现在非洲。
