With the development of cloning technology, the debate over human cloning has been intensified加强. Proponents建议者, 支持者 of human cloning believe that this technology will benefit those couples who cannot have children. However, I insist that human cloning should be banned for the following reasons.

First of all, biological problems underlying cloning are so complex that human cloning is unsafe. It is well known that animal cloning has a high rate of failure. Many animals are born dead or deformed残废的. Even if some survive, they may have defects from which they will die of later on. It was reported that the cloned mice that appeared normal showed evidence of证明, 说明, 表明 genetic mutation(生物物种的)突变. This is because the regulatory mechanisms调节机制, which occur normally during development, are disturbed during the process of cloning. We simply do not have enough knowledge about cloning and the technology at this stage. If we clone humans, we may produce many abnormal反常的, 变态的 kindred, which will be nothing but a disaster to our human kind.

Moreover, human cloning will bring some social and moral problems. For example, those couples who are unable to have children might choose to have a copy of one of them(e.g. a copy of the husband). However, how should the wife react to a physical copy of her husband who she is in love with? In addition, when the copy meets friends or relatives of the original, these people will confuse the original with the copy. How they should treat the copy would be another problem. Besides identity身份, his social status would be a great headache to the society.

In conclusion, human cloning should be prohibited in the world because it is scientifically unsafe and will trigger引发, 引起 social and moral crises. Any attempt to clone humans is an irresponsible action to human life and should be severely punished.