But they are difficult to make and require the use of an embryo or cloning technology.

但是制造他们是很困难的，而且需要使用胚胎或者是克隆技术。

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He says that the agency must take a position on new technologies, such as genetic copying or cloning.

他说该机构必须对新技术明确立场，例如基因复制或者克隆。

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Other nations, including the United States, are split over whether to ban just human cloning or cloning of all kinds, including the production of stem cells.

其他一些国家，包括美国，则在是否要禁止克隆人还是禁止克隆所有物种，包括克隆干细胞上，存在分歧。

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Cloning? Well, I hate to land on one side of the debate or the other

克隆？我不希望在这种争论中选择某一个立场，

生物克隆是热点问题 - SpeakingMax英语口语达人

DNA cloning, or any kind of cloning just means 'making copies of'.

NA克隆,或者任何一种克隆,本义就是"复制"

耶鲁公开课 - 生物医学工程探索课程节选

"It doesn't have to be, you know, embryo stem-cell research or fetal or cloning, " Lott said.

CNN: Lott says he's opposed to federal funding of stem-cell research

So I call on the Congress to pass legislation that bans unethical practices such as the buying, selling, patenting, or cloning of human life.

NPR: Text of Bush's State of the Union Address

It will only be as a result of having a systematic large-scale study that we will be able to give accurate comments as to whether or not this does arise as a result of cloning or not.

BBC: Head-to-head: Cloning