Biological gas生物气biologicaladj.生物的；生物学的biological filtration process生物过滤法biological perceptual pattern[计] 生物性知觉构型biological activated charcoal生物活性炭Biological chromium reduction生物除铬biological experimental class生物实验教学biological aerated filter bed曝气生物滤池biological population theories生物学派人口理论biological treatment of sewage[医] 污水生物学处理biological products management物制品管理biological assistantgrowthunit助长器