- The rainwater washes them down the hillsides as far as the sea.
雨水把它们从山坡冲入大海 - Erosion impoverishes the quality of the soils,
将土地侵蚀得更为贫瘠 - Reducing their suitability for agriculture.
使它们不宜耕种 - In some parts of madagascar, the erosion is spectacular.
马达加斯加某地 侵蚀尤为显著 - Whole hillsides bear deep gashes hundreds of meters wide.
山坡布满数百米宽的深坑 - Thin and fragile, soil is made by living matter.
土壤由生命物质构成 单薄而脆弱 - With erosion, the fine layer of humus,
数千年形成的腐殖质图层