经济学家警告，迫使人们向西部迁移的压力可能会增至很大的程度。Economists warn that enormous pressures could build up, forcing people to emigrate westwards.南部的种植园主买下了向西部迁移的小农的土地.Planters in the South bought land from small farmers who moved farther west...

“迁移的”的英语可以翻译为：migratory ...