In blocking federal funding for stem cell research, Bush sided with religious conservatives who argue that research on embryos destroys human life, albeit at its earliest stage of development.

尽管胚胎处于人类的早期阶段，但是布什和保守派人士仍认为胚胎的研究摧毁了生命，并阻止了联邦基金资助干细胞研究。

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The genetic changes cause the bodies of the insects to attack the Plasmodium parasite, blocking its development.

VOA: special.2010.04.20

The changes cause their systems to attack the parasite, blocking its development.

VOA: special.2009.12.22