1. A biological agent, such as an infectious microorganism, or a condition that constitutes a threat to human beings, especially in biological research or experimentation. 
   生物危害一种生物制剂，如传染性细菌或对人类构成威胁的一疾病，尤指在生物学研究或实验中的
2. Karl Marx's books about human nature exhausted this subject. 
   卡尔。马克思的有关人性的书籍对此问题阐述极为详尽。
3. Many people object to experimentation on animals. 
   许多人反对用动物做实验.
4. The process of conducting such a test; experimentation. 
   实验过程做这种试验的过程；实验
5. After years of experimentation they finally hit pay dirt. 
   他们经过数年的试验，终于成功了。

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