The depositional slope-break belt controls the development of sediment system of eroded valley-low stand delta.

低水位时期坡折带控制了下切谷-低位三角洲沉积体系的发育。

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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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