四、环境与动物保护when the killing stops, the buying can, too.动物本质动物，作为生态系统的一个重要部分，对生态系统的持久和人类的安定有深远的影响。
所有动物都是由食物链构成的。
因此，一个物种的死亡就会导致另一个物种的人口过度或者人口不足，然后把这个物种置于灭绝的边缘。
更重要的是，自然平衡就会被打破，生态系统无法持续Animals, as a significant part of an ecosystem, have profound impacts on the sustainability of an ecosystem and the wellbeing of humanity. All animals are connected in one way or another in food chains. For this reason, the death of a species can lead to overpopulation or under population of another species and then put this species at the verge of extinction. The natural balance will be disrupted and the ecosystem cannot be sustained.保护动物的意义人类可以从动物身上获得灵感draw on animal-based research for inspiration，radar was invented according to the physical advantage of the bats；动物有生存的权利，应该维护动物的权益animal welfare动物是我们忠实的朋友。
Animals are our loyal friends, who havefacilitated our life a great deal. For example….Therefore, our life will be less convenient and monotonous without the company of the animals.动物实验：不是所有的动物都会在实验中被杀死。
而是，大部分动物都会被释放。
除此之外，和自然死亡率相比，在实验中死去的动物几乎可以忽略不计。
另一方面，大部分动物被用来测试药物看看他们是否有副作用。
这种实验并不仅仅是为了人类自己的利益，还为了动物的利益。
比如，一些药物发现可以被兽医使用来给生病的动物做药物治疗。
如果我们不借助于动物，可能导致没有实验没有其他替代品。
结果就是，许多有效的药物不能被检验，引进.not all the animals are doomed to be killed. Rather, the majority would be set free. In addition, compared with the natural death rate, animals dead in the experiment would be virtually neglected. On the other hand, most animals are used to test the medicines to see whether they have some side effects. The experiments are not only for men’s own interests but also for the benefits of animals. For instance, some medical discoveries can be used by veterinary surgeons to give medical care and treatment to sick animals. Without the animals for test, there could not be other substitutes so that many of the effective medicines are unlikely to be examined and introduced我们都知道，在人体上做活体解剖是残忍的。
而动物有这个和人类相似的器官，可以对外界的干扰产生相似的回应。
另外，动物没有人类的神经丰富，而且在实验中，实验者通常会最小化疼痛，来减轻遭罪。
因此，他们被认为是最好的实验替代品We all know, it is inhumane to practice vivisection on humans, while animals bear a resemblance/similarity to humans in organs, which can respond similarly to external disturbances. In addition, animals have a less sophisticated nerve than the human beings, and in the experiments, the researchers have minimized the pain to relieve their suffering. For this reason, they are believed to be the best substitutes in the experiments.反对动物的生存权需要被保护，禁止虐待行为the prohibition of torture; forbid the abuse of the animals动物试验的目的只是为了一些商业用途commercial purposes，这是不道德的,例如化妆品产业the cosmetic industry has been exploiting animal experiment simply for diversifying products and maximizing profits. The fewer cosmetics people use, the fewer animals they have to slaughter.动物试验的结果是和信息是不可靠的，具有误导性unreliable and misleading毕竟动物和人类有很大的不同关于动物做食物：支持富含蛋白质high in protein和必要的营养物质essential nutrients，没有替代品alternative食物链food chain有捕食者hunters也有被捕食者prey，物竞天择，适者生存，这是自然法则反对肉类富含动物脂肪和胆固醇high in saturated fat and cholesterol，吃肉过多over consumption有害健康所有动物都有生命权entitled to possess their own lives工业化农场经营导致环境污染，一些食物是疾病的来源responsible for the food borne disease，进而影响健康pose health risksshark finmad cow disease, bird flu, hoof-and-mouth diseaseSome people think it is acceptable to use animals for the benefit of humans. Other people think it is wrong to exploit animals for human purposes. Discuss both views and give your own opinion. (08.02.02)同意：人类开发使用动物，但很多都是在可接受的范围之内的acceptable，例如，我们大多食用一些家禽、牲畜而不是野生动物，对于生态平衡不会产生影响；现在的很多动物试验都是在人道并且不杀死动物的前提下进行的；我们为了娱乐饲养宠物，而他们也得到了关爱；我们建动物园，在观赏和娱乐的同时，也保护了很多濒危的动物。
不同意：很多人为了利益，非法猎杀野生动物比如，Kill the foxes, bears or even the little hares for fur to make fashionable costume just for the sake of the superficial beauty. These cruel behaviors pose severe misery on these poor animals.现代的医学试验，虽然大多不需要杀死动物，但无可避免给动物带来痛苦动物园Some people think that zoos are cruel and all the zoos should be closed. However, other people think that zoos are useful to protect the rare animals. Discuss both views and give your own opinion.很多动物在动物园里虽然得以生存，但是失去了自由和在野外环境生存的能力。
这可能导致动物的心理问题，造成孤僻的行为。
动物园给主要给人们提供观赏，娱乐。
而有些低素质的人很可能做出一些伤害动物的事情。
比如用石头等硬物击打小动物，或者给小动物吃一些不该吃的东西，导致他们的死亡。
在很多报道中，我们就可以频频看到动物园里的动物因为人们的行为而致死。
但可是只要我们能够给动物们提供一个非常舒适，接近于大自然的环境，并且阻止观众伤害动物，这些问题都可以避免的。
不仅如此，在自然保护区或者动物园里natural reserve and zoo, 工作人员会通过一些手段来帮助动物进行交配help the animals with mating, 这有助于动物的繁殖propagate，防止动物灭绝。
例如，在中国，珍贵动物熊猫大多数都是在人们的帮助下繁衍的reproduce.动物被用作药物适用Some people think it’s necessary to use animals for testing medicines intended for human use. Others, however, think it’s not right to do that. Discuss both of these views and give your own opinion.从哪方面保护动物（防止灭亡还是注重人们的问题）Many animal species in the world are becoming extinct nowadays. Some people say that countries and individuals should protect these animals from dying out, while others say we should concentrate more on problems of human beings. Discuss both views and give your opinion.观点一保命话题观点二：保护动物有时要花费很多钱，尤其是濒临灭绝的动物。