What prevented Chris Cocalis from developing e-bikes sooner?

是什么阻碍了克里斯·科卡利斯更迅速地开发电动自行车？

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But as the Sun gradually burned hotter, what prevented Earth from becoming overheated?

但是太阳逐渐变得更加炎热，是什么阻止了地球变得过热呢？

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Working with rodents, researchers watched what happens when they either prevented neurons from being born or made them sprout faster.

在对啮齿动物的研究中，研究人员通过阻止神经元生长或刺激它们快速生长来观察这两种模式下会产生怎样的结果。

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In many ways that is what prevented medicine is about.

这也是预防医学所关注的。

哈佛公开课 - 幸福课课程节选

The scrum-half prevented what seemed a certain Ospreys try in the first half, then scored himself in the second.

BBC: Ospreys 21-25 Munster

And again, as I said our conversations with the Libyans, particularly those at the Libyan National Council, in the last few hours indicate that the efforts here really in their view have prevented what could have been a catastrophe at Benghazi.

WHITEHOUSE: Press Briefing

Worse yet, those who prevented what are now provisions of Judiciary Committee Chairman James Sensenbrenner's "REAL ID" bill from becoming law in 2004 are no less determined to block this legislation again in 2005 - and, thereby, to perpetuate America's vulnerability.

CENTERFORSECURITYPOLICY: Unfinished business