格莱斯说：“大家都听说过这严酷的说法：珍贵的表土因过度耕作肥力降低，亚洲上空尘云遮蔽，焦干的土地荒漠化，河流行将干涸。”
"We've all heard the stark anecdotes: precious topsoil weakened by over-farming, dust clouds darkening the Asian skies, parched land becoming desert and rivers running dry, " said Mr Grice.
保护地表土层对于保护草地资源和生态环境，以及沙漠化防治具有极端重要性。
The protection of top soil layer has utter most importance in protection of grassland resources and ecosystem, and in prevention of sandy desertification.
表土因土地开发、侵蚀和荒漠化而不断损失。
We lose topsoil to development, erosion and desertification.
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