Nowadays, science has become a significant part of human's life. Indeed, many kinds of research could save people from the spread of diseases. The development of technique has been attended at a high level, which adopted live animals to create vaccines, medicine, e.t.c. A segment of people says that such action is ill-nature and inessential; few think that these researchers aimed for human benefits. In the further paragraph, I would like to examine both the points and give my opinion regarding it.