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Cloning
克隆
Cloning is the process of creating a genetically identical copy of an organism.
克隆是创造一个基因完全相同的生物体副本的过程。
Researchers have been experimenting with cloning since the 1900s, when they attempted to create genetic copies of animal embryos.
自20世纪90年代以来，研究人员一直在进行克隆实验，当时他们试图创造动物胚胎的基因副本。
As technology became more advanced, it became possible to make clones of fully-grown creatures.
随着技术变得越来越先进，克隆完全成熟的生物成为可能。
The first successful cloning of an adult organism was in 1996, when a British research group managed to produce a cloned sheep.
第一次成功克隆成年生物是在1996年，当时一个英国研究小组成功地克隆了一只羊。
The sheep’s name was Dolly, and she lived for six years.
这只羊的名字叫多莉，她活了六年。
Scientists have since managed to clone many other types of animals.
自那以后，科学家们成功地克隆了许多其他类型的动物。
In fact, there are now companies that offer expensive pet cloning services.
事实上，现在有一些公司提供昂贵的宠物克隆服务。
The idea of human cloning has come up in scientific discussions, but many people have ethical concerns about the consequences.
克隆人的想法已经出现在科学讨论中，但许多人对其后果有伦理上的担忧。
Because of this, human cloning is illegal in several countries.
因此，克隆人在一些国家是非法的。
