Soil erosion is one of the ecologicalenvironment problems in the earth.
土壤侵蚀是全球性的生态环境问题之一。
2
Water and soil erosion is one of the prominent ecologicalenvironment problems of Haihe River Basin.
水土流失是海河流域较为突出的生态环境问题之一。
3
Construction ofecologicalenvironment forest, urban protection forest, water and soil conservation, production and comprehensive utility and development of nursery stock.