One rejected proposal included a plan to clone a human embryo and use it to produce new stem cells. Dr.

一项被拒绝的方案包括计划克隆一人胚胎、并用之来制造新的干细胞。

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On the one hand, some scientists point out that if you clone a embryo, you can produce valuable tissues and organs that could be used to save human lives.

一方面，一些科学家指出如果克隆一个胚胎，就可以制造出有价值的组织和器官，可以用来挽救人类的生命。

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The first scientists to clone a human embryo admitted today that there were ethical lapses in the way the research was carried out.

NPR: Top Stem-Cell Researcher Resigns After Ethical Lapse