natural oil天然油
naturaladj.自然的;天然的;私生的
natural caving mining method自然崩落法
Natural mountains and rivers自然山川
natural ecological imbalance自然生态危机
naturalism education thought自然主义教育思想
natural-convection cooling自然对流冷却
naturalization of parameters参数归一化
natural extracts of rosemary天然迷迭香
natural ventilating dry kiln自然通风干燥窑