1. The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation,[主句] so that a cycle of progressive surface deterioration is established.[结果状语从句]
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2. During the dry periods[时间状语] that are common phenomena along the desert margins,[定语从句] though, the pressure on the land is often far in excess of its diminished capacity, and desertification results.[主句]
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