骨头分解,土地侵蚀,气候变化,森林重生,河流改道——而历史,如果没有被摧毁,也会被逐渐掩盖。
Bones disintegrate, the land erodes, the climate changes, forests come and go, rivers change their course — and history, if not destroyed, is steadily concealed.
土地侵蚀确实也是水质的一个主要危害。
并且由于丰富的表层土被冲刷掉,土地侵蚀威胁到农作物产量。
And because it washes away rich topsoil, erosion can threaten crop yields.
Soil was being eroded and wasted along the Eastern seaboard, and they were using up the great soils of the Mississippi Valley and over time that slave system just somehow wasn't going to work out.
东部沿海地区的土地因被侵蚀而荒废掉,密西西比河谷地区的土地资源即将被耗尽,但就在这种情况下,奴隶制依然能维持南方的经济
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