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。
作为一种保护措施，人工饲养可以暂时增加某个濒危物种的数量，但是却不能改变这种野生动物面临灭绝的困境。从根本上讲，某种野生动物数量锐减，是栖息地丧失造成的。研究员认为，成功的保护，应该是让野生动物的种群在它的生存环境中自然恢复、达到自然换代的水平。As a protective measure，artificial feeding can be a temporary increase in the number of endangered species，but do not change that wild animals face extinction In essence， some kind of sharp drop in the number of wild animals， are a result of habitat Researcher believes that the success of protection， should allow the species of wild animals to survive in its natural environment to the natural replacement
