With erosion, the fine layer of humus, 数千年形成的腐殖质图层

234. In some parts of madagascar, the erosion is spectacular.
     马达加斯加某地 侵蚀尤为显著
235. Whole hillsides bear deep gashes hundreds of meters wide.
     山坡布满数百米宽的深坑
236. Thin and fragile, soil is made by living matter.
     土壤由生命物质构成 单薄而脆弱
237. With erosion, the fine layer of humus,
     数千年形成的腐殖质图层
238. Which took thousands of years to form, disappears.
     因雨水侵蚀消失殆尽
239. Here's one theory of the story of the rapa nui,
     拉帕努伊岛[复活节岛的俗名]的故事
240. The inhabitants of easter island,
     岛上居民的遭遇

来自《家园 第二部分 Home Part2》第 237 行