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来源:雅诚德英语网
Soil erosion and soil degenerated by erosion is a main environmental problem in the world.
土壤侵蚀及其导致的土壤质量退化是世界性的重大环境问题之一。
Soil erosion and soil degenerated by erosion is a main environmental problem in the world.
土壤侵蚀及其导致的土壤质量退化是世界性的重大环境问题之一。