| environ. | desertification control Remedial and preventive actions adopted against desertification include irrigation, planting of trees and grasses, the erection of fences to secure sand dunes, and a careful management of water resources | 沙漠化控制 (避免沙漠化所采取的补救和预防行动，包括灌溉、植树、植草、建立栅栏保护沙丘以及水资源的细心管理。) |