The broad valley led up to a high plateau of cultivated land.那个宽阔的山谷通往一处平整的开垦地高原。A broad valley opened up leading to a high, flat plateau of cultivated land.一条宽阔的山谷展现在眼前，通往一处平整的开垦地高原。In desert areas shifting sand used to encroach on the cultivated land.在沙漠地区流沙常侵蚀耕地。