When we use it up, we'll have to wait million of years for it to build back up, or figure out some non-prohibitively expensive way to recover it from the atmosphere.

用光之后，我们将不得不等上数十亿年使它们重新产生，或者想出一些不至于昂贵到令我们望而却步的点子，直接从大气中收集氦气。

youdao

I build myself up and fly around in circles, waiting as my heart drops and my back begins to tingle. Finally, could this be it?

我自我鼓舞并在空中盘旋，等待我的心掉落而且我的背开始刺痛。最后，是否就是这样？

youdao

So, it is essential to deepen the understanding theority of sending back for retrial procedure and provide legislative suggestion on how to build up the system more perfectly and scientifically.

因此有必要从理论上加深对发回重审制度的研究，并为逐步建立一套科学、完善的发回重审制度提供立法建议。

youdao

I have yet to show you the solution to a wave function for the hydrogen atom, so let me do that here, and then we'll build back up to probability densities, and it turns out that if we're talking about any wave function, we can actually break it up into two components, which are called the radial wave function and angular wave function.

我还没有给你们看过,氢原子波函数的解，让我现在给你们看一下，然后再来说,概率密度，实际上,对于任何一个波函数来说，我们可以把它,分解为两部分，分别叫做径向波函数,和角向波函数。

麻省理工公开课 - 化学原理课程节选

"It would be nice to get back there because obviously it meant that as far as I had dropped, to build my way back up to this point, I've had some wins, I've had some very high finishes, I've been consistent, " said Woods, who dropped as low as 58th following his well-publicized divorce and injury problems.

CNN: STORY HIGHLIGHTS

Seven months after Superstorm Sandy, the mayor announced a new effort to speed up remaining repairs: NYC Build It Back.

WSJ: NYC mayor announces new effort on Sandy repairs

It is not as simple as encouraging patients to build muscle back up on their own, though.

BBC: Could fitness be key to cancer surgery success?