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Perfect Harmful Biological Early Warning System Promoting Grass for Sustained Development The early warning system of environmental quality in production base of green food supported by GIS—A case study from the national ecological agriculture demonstration area in Qing’an County，Heilongjiang Province An Early Warning System to Predict Waterlogging Injuries for Winter Wheat in the Yangtze- Huai Plain (WWWS) Research on early warning methods of essential Chinese medicine supply based on Chinese materia medica resource survey