Therefore, many countries are not so resolute and thorough in banning human embryo cloning.

因此，在禁止使用克隆人类胚胎方面，世界各国的态度并不坚决而彻底。

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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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Influences of embryo quality and type differentiation stayer media passage and digestion fluid on embryonic cell separation and cloning were discussed respectively.

本文就胚胎质量和胚胎类型分化抑制物培养基传代时间和消化液等方面对胚胎干细胞分离克隆的影响进行了讨论。

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Advocates of human embryo cloning for medical research claim the practice could lead to the discovery of treatments for illnesses currently deemed incurable.

CNN: France forbids human cloning

Dolly the sheep -- the first cloned animal -- was created over 10 years ago, and the only previous claim of human embryo cloning by South Korean scientist Woo Suk Hwang in 2004, was discredited.

CNN: You, again: Are we getting closer to cloning humans?

And in the 2004 paper which they first announced their success in cloning an embryo, they used 242 eggs from 16 women.

NPR: Top Stem-Cell Researcher Resigns After Ethical Lapse