leachyadj.有气孔的；能渗透的leachn.垂直帆缘；后缘=leech.v.过滤；萃取；溶解出leaching resistance抗流失性leaching irrigation淋洗灌溉leaching procedures浸取过程leaching management教务管理leachate irrigation渗滤液灌溉leaching evaluation教学评价leaching experiment淋溶实验leached alkali soil淋溶碱土leachate properties浸出毒性leaching and uptake淋溶