natural son私生子naturaladj.自然的；天然的；私生的natural ventilated building自然通风气楼natural background analysis自然本底分析natural crystal of minerals天然矿物结晶体natural consequences of acts[法] 行为的自然结果natural clarification method自然澄清法Natural Green Colored Cotton绿色天然彩棉natural language programming[计] 自然语言程序设计natural resources' depletionnatural-language searching自然语言检索natural soft base foundation天然软土地基