The terrible constraint on organ transplantation is that every life extended depends on the death of someone young enough and healthy enough to have organs worth transplanting.

器官移植的可怕约束是，一个人生命的延长要依赖于另一个足够年轻、健康的人的死亡，因为只有这些人身上才有值得移植的器官。

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The terrible constraint on organ transplanation is that every life extended depends on the death of someone young enough and healthy enough to have organs worth transplanting.

器官移植的可怕限制是，每延长一个人的生命都取决于一个有值得移植的器官的人的死亡，这个人足够年轻且足够健康。

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Dispelling researchers' initial doubts, computer models have confirmed that this formation is buoyant enough to rise slowly within the mantle and strong enough to push Africa upward as it rises.

计算机模型消除了研究人员最初的疑虑，证实了这个结构有足够的浮力在地幔内部缓慢上升，并且有足够的力量在它上升的同时推动非洲板块上升。

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There is enough for Caroline to go to boarding school in Baltimore,Maryland and continue her music." said the Captain.

VOA: special.2009.02.14

Yes. In fact, there is not enough energy in a single photon to go ahead and eject an electron from this zinc surface.

是的，事实上，这里的光子没有足够的能量,去从锌表面逐出一个电子。

麻省理工公开课 - 化学原理课程节选

That's funny. I mean, that's really cool. If someone is witty enough to do that, then it's awesome.

这确实很好笑，真的很酷！如果有人真的够诙谐能做出那种事，真的很棒！

街头艺术 - SpeakingMax英语口语达人

Would they dig in their heels and stay? would they say enough is enough?

CNN: One block, two tornadoes: Life in the crosshairs

And I personally will be making every effort to spread the message that ENOUGH IS ENOUGH.

FORBES: America's Burgeoning Class War Could Spell Opportunity For GOP

Automakers have been waiting for consumers to finally say enough is enough for their old rides.

FORBES: Fie on High Gas Prices -- February Car Sales Soar