natural bow静挠度, 自然挠度naturaladj.自然的；天然的；私生的natural vibration propertiy of structure自振特性natural convection boundary-layer flow自然对流Natural Numeral Marvelous Imagery Memory自然数码奇象记忆natural electromagnetic field fluctuation自然电磁场起伏natural convection air-cooled condenser自然对流空气冷却式冷凝器Natural Resource and Environmental Assets自然资源与环境资产natural gas transmission and distribution天然气输配natural eco-tourism resources in Shanxi山西自然生态旅游资源Natural pearls and semi-precious stones葡萄牙求购天然珍珠,半宝石natural killer cell mediated cytotoxicity天然杀伤细胞介导细胞毒性