荒漠化这一形式的土地退化，使肥沃的土地变成了沙漠。
Desertification, is a form of land degradation, by which fertile land becomes desert.
几英尺厚的灰尘和火山灰使肥沃的土壤窒息，致使日本南部两个世纪内都无法居住。
Dust and ash several feet thick smothered the fertile soil, rendering southern Japan uninhabitable for two centuries.
原因是，肥沃的火山土壤使这片土地极适于农业。
The reason is that rich volcanic soil makes the land fantastic for farming.
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