我们把这叫做表土危机。
Water sank rapidly through topsoil.
水很快地渗透了表土。
The topsoil has been almost completely washed away.
表层土壤已差不多完全给冲走了。
When all the topsoil is gone, nothing remains but a worthless desert.
当表层土流失后，就只剩下一片无用的沙漠。
When all the topsoil is gone, nothing remains but a worthless desert.
当表层土流失后，就只剩下一片无用的沙漠。
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