Human triploid fetuses are usually spontaneously aborted.

人类的三倍体胎儿通常会自然流产。

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Sexual relations will be intended purely for the sake of reproduction and unwanted fetuses will be aborted.

性关系,将只是单纯为了生育,而有缺陷的胎儿将会被流掉。

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Federally funded scientists can also derive stem cells, after informed consent, from aborted fetuses, but this practice is not without controversy.

CNN: NIH publishes draft guidelines for stem cell research

Dr Frisen reckons that they may offer several advantages over human embryonic stem cells which, although easier to manipulate, are a controversial source of new tissue because they are still mainly obtained from aborted fetuses.

ECONOMIST: Stem cells

Supporters of ongoing stem cell research -- which is controversial enough on its own because some existing stem cell lines were created from cells extracted from aborted fetuses -- say the field of study holds the promise of reversing or even curing many diseases.

CNN: Democrat blocks Senate debate of cloning ban