natural enemy参考翻译

natural key自然分类特征naturaladj.自然的；天然的；私生的natural colouring matter天然色素natural vibration period自振周期Natural Order Hypothesis多维元素片natural language support自然语言支持natural chaste education性纯洁教育natural synthetic rubber合成天然橡胶natural vegetable powder天然植物粉(含psyllium hydrophilic mucilloid)<缓泻药>Natural clarifying agent天然澄清剂natural gas liquefaction天然气液化natural protecting areas自然保护区

1. Some animals have no natural predators.
   有些动物没有天敌。
2. Study on Parasitical Natural Enemy Insect of Saperda populnea L.
   青杨天牛寄生性天敌昆虫初步研究。