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land conservation
desert.	国土保护
earth.sc.	土地保护【土】
ecol.	土地保护
tech.	土地保存; 地资源保持
land conservation The care, preservation and re-use of solid areas of the earth's surface, especially soil regions valued as a natural resource or utilized as an agricultural resource
environ.	土地保护 (地球表面坚固地区的管理、保护和重利用，特别是作为天然资源和农业资源的土壤地区。)

land conservation: 26 phrases in 10 subjects

Agriculture	1
China	1
Desert science	2
Earth sciences	5
Ecology	3
Economy	1
Environment	2
Name of organization	3
Technology	5
United Nations	3