natural son私生子naturaladj.自然的；天然的；私生的natural renewable resources自然生产力natural community structure群落结构natural steam power station地热发电站natural bonded molding sand[机] 天然模砂natural forest regeneration自然森林更新natural rights in civil law民法上自然权利Natural quality of farmland耕地自然质量Natural occurring compounds生物源化合物natural-draft transformer自然风冷变压器natural gasoline stabilizer天然汽油稳定剂