短语词组短语soil aeration porosity 土壤通气孔隙度soil aeration rate 土壤通气率soil aeration and permeability 土壤通透性能soil layer in aeration zone 包气带土层Aeration soil 土壤通氧aeration of soil 土壤通气aeration zone soil 包气带土壤 返回 soil aeration