地球的“皮肤癌”---对土壤侵蚀环境问题的通俗理解 刘亮 西北农林科技大学水土保持研究所 马� . Ames: Iowa State University Press, 1995. 2 Montgomery D. R. Soil erosion and agricultural sustainability . Proceedings of the National Academy of Sciences of the United States o ...
“ I don't think that when people grow up, they will become more broad-minded and can accept everything. Conversely, I think it's a selecting process,knowing what's the most important and what's the least. And then be a simple man.” ...
My Most Unforgettable Travel Experience: Hiking through Maowusu Desert By Liu Liang 2011-6-6 Three years ago, I traveled to Maowusu Desert with another friend on foot during summer holidays, and experienced something truly unforgettable. As everybody knows, Maowusu D ...
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