The most successful groups of land plants are those that evolved methods of fertilized sex cell dispersal that are independent of water and structures that protest developing embryos from drying out.

最成功的陆生植物群体是那些进化出了受精性细胞散布方法的群体，这些方法不依赖于水和防止发育中的胚胎干涸的结构。

youdao

Therapies using stem cells, or cells derived from embryos that can turn into myriad cell types, can potentially restore normal hearing.

干细胞(也就是可分化为胚胎来源、可分化为多种细胞的细胞)疗法，可能恢复正常的听力。

youdao

The explanation for this must lie in the biochemical maturity of eight-celled embryos compared with their junior, four-cell siblings.

对于这一现象只能解释为，在生化意义上发育至八个细胞的胚胎比只有4个细胞的初级胚胎要成熟。

youdao

But opponents say stem cell experiments are wrong because human embryos are destroyed.

VOA: special.2009.04.07

stem cell research can go on without the ethical dilemma provided by killing embryos.

干细胞研究者可以免受由于杀死胚胎而带来的道德困境。

干细胞和伦理 - SpeakingMax英语口语达人

Opponents of embryonic stem cell research, which involves destroying the donated embryos from which cell lines are derived, have long argued that the discovery of iPS cells in 2006 (for which Shinya Yamanaka was awarded the Nobel Prize in Medicine this past year) obviates the need for embryonic stem cell research.

FORBES: Scientists Relieved As Supreme Court Passes Over Case Against Embryonic Stem Cell Research

Palin, an evangelical Christian, opposes embryonic stem cell research because it involves the use of human embryos, but her running mate, GOP presidential nominee McCain, does support stem cell research involving embryos.

CNN: Biden's comments on special needs kids called 'new low'

The connection is that embryos for stem cell research primarily come from fertility clinics.

CNN: graphic