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soil and water conservation
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soil and water conservation
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水土保持
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soil and water conservation
水土保持
防治水土流失,保护、改良与合理利用水土资源,维护和提高土地生产力,以利于充分发挥水土资源的生态效益、经济效益和社会效益,建立良好生态环境、保障经济社会可持续发展的综合性科学技术。
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ring-moon
ring morphism
ring mountain
Ring Nebula
ring nebula
ring-neck pheasant
ring network
ring object
ring of adeles
ring of algebraic integers
ring of algebraic Weil cohomology classes
ring of constants
ring of differentiable functions
ring of differential operators
ring of differential polynomials
ring of dual numbers
ring of endomorphisms
ring of finite generation
ring of finite presentation
ring of fractions
ring of functions
ring of germs
ring of integers
ring of invariants
ring of Jupiter
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