natural oil天然油naturaladj.自然的；天然的；私生的natural mortality coefficient天然矿物质Natural and Cultural Resource自然文化遗产natural geography environment自然地理环境natural gas chemical industry天然气化工NATURAL PLAGUE FOCI IN YUNNAN云南的鼠疫自然疫源地natural vegetation management地面管理natural environment influence自然环境影响natural stone-like coatings天然真石漆natural nuclei with odd-odd天然奇奇核素natural environment resources自然环境资源