natural age自然年龄
naturaladj.自然的;天然的;私生的
natural span of livestock life家畜寿命
natural vegetal feed additives天然植物性添加剂
natural frequency distribution固有频率分布
natural quality classification等级
natural coal mine drainage pit排水矿坑
natural increase of population人口自然增长
natural ecological perspective自然生态观
natural latex-based adhesive天然胶乳型粘结剂
natural depletion oil recovery天然能量开采的原油采收率