In order to explore the mysteries of nature， expand human vision， increase wisdom and invent， animals should sometimes be regarded as 为了探索大自然的奥秘，为了扩大人类的视野，为了增长智慧，为了发明创造，有时应当把动物当作老师。For example， the invention of radar was created step by step on the basis of the study of Submarines are created on the basis of studying why fish sink into the water and why they float to the 比如雷达的发明，就是在研究蝙蝠的基础上一步步创造出来的。潜水艇是在研究鱼为什么会沉入水中、又为什么浮到水面的基础上创造出来的。The main reason for using model animals in research is the principle of evolution， that is， all organisms have a certain degree of correlation and genetic similarity due to their common 在研究中使用模式动物的主要原因是进化原理，即所有生物由于共同的祖先而具有一定程度的关联性和遗传相似性。Therefore， the study of Human Kinship classification can provide a lot of information about human mechanisms and diseases， which is useful in 因此，对人类亲缘分类的研究可以提供大量关于人体内机制和疾病的信息，这些信息在医学上是有用的。
Nowadays， experimental usage of animal has become a widely concerned issue around the world。 People hold diverse views towards it。Adversaries claim that it is an extremely crude behavior。 Animals， especially mammals， like dogs， cats， rabbits， rats， which are the major victims in the experimentation， are usually human‘s pets。 Pets owner are strongly against it for they firmly believe that animals suffer physically and mentally as we do。 When equality is advocated in the modern world， it is inhuman to disrespect creatures that are not human beings。 Furthermore， a number of experts pointed out that it would be at high stake of depend on the results of animal experiment； since they differ from us in many ways， take the body structure for example， we cant imagine humans try to jump from the height of nine stories without any protection because cats survive out of the same test。Those in favor of the idea about usage of animal declare that using animal is an advisable choice。 On one hand because their bodies function similar to ours， for instance， they catch colds， suffer from stomachs and heart diseases， which more importantly influenced by diet and habits。 The consequences of the test may not be applied to humans， although they are highly connected to the human situations。 On the other hand， those creatures yell and act abnormally when they feel uncomfortable， which is what exactly researchers expect。 In addition， there is an easy－to－answer question： isn‘t it crueler to test directly on people with little knowledge on the objects effects？ In a word， there is nothing better than animal that resemble human the best for experiment。Personally， I am not a supporter of animal experiments， yet there is anything more suitable that can replace them， I accept using animals for tests， but take good care of them when they are not in the laboratory。
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