大学英语：Animal research has made great contributions to human medical development

　　1.动物研究对人类医学的发展做出了重大的贡献。
　　Animal research has made great contributions to human medical development.
　　Animal research has contributed a great deal to the development of human medicine.
　　2.动物研究是否与人体健康有关，人们持不同态度。
　　People have different ideas about whether animal research is relevant to human health.
　　3用于实验的动物数量在过去二十年中已大大减少了。
　　The number of animals used in experiments has declined greatly over the past 20 years.
　　研究的新成果表明，少数实验可以放弃使用动物。
　　4.The new research findings show that a few experiments can be done without using animals.
　　The new development in research has shown that a small proportion of tests can be done without using animals.
　　5.尽管医学技术越来越先进，但完全停止使用动物做实验仍然很远。
　　Although medical techniques are becoming more advanced, stopping testing on animals altogether is a long way away.
　　Although medical technique becomes more and more advanced, stopping testing on animals altogether is a long way away.