Simulation Analysis of Polystyrene Cystosepiment and Straw Board Lamination Compound Materials Heat Preservation Performance Based on ANSYS Construction of Binary Expression Vector Containing Cry2Aa2 and PamPAP and Its Transfer to Pepper Research progress on urban carbon fluxes based on eddy covariance technique. Effect of Wheat/Maize/Soybean and Wheat/Maize/Sweet Potato Relay Strip Intercropping on Soil Nitrogen Content and Nitrogen Transfer