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And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.
科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战
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It's been a while since I've been doing that because I haven't had as much free time as I would have liked.
我已经很久没有播报了。因为我最近都没有太多的空余时间。
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We've known since antiquity that you could take gold, and you can hammer to very, very thin foil.
我们已经知道很久以前，人们就能用锤子把金敲成非常非常薄的箔片。
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It takes so long that by the time the spaceship comes back, 100 years will have gone by.
去了很久，以至于宇宙飞船回来的时候，100年都已经过去了。
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Now this is a good place to start, because we are very familiar with ionization energy, we've been talking about it it's that minimum energy required to remove an electron from an atom.
现在这是一个开始下面内容的好地方，因为我们已经很熟悉电离能了，我们从很久以前就一直在讨论,它是从一个原子中,拿走一个电子所需要消耗的最低能量。
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And if you wait too long, maybe I'll be somewhere else designing too.
如果你很久都不来美国，我可能已经到别的地方去做设计了。
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It's been a really long time since I have personally followed basketball.
我个人看篮球真的已经很久了。
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And I've been preparing for this moment for a long time now.
为这一刻我已经准备很久了。
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Well,De Gaulle has been dead for a very long time, and there has been progress, but what has not changed is still the power in Paris, in these ministries, to dictate the life of schools, of almost everything else.
戴高乐已经去世很久,在某些地方已经有所改进,但是巴黎的权利,政府各部门的权利仍未改变,他们规定校园生活,还有几乎其他任何事情
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and they have just been waiting to tell you this forever.
他们打算跟你分享这个好消息已经很久了。
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because it had been established here before, but like,
因为这个俱乐部已经成立很久了，但是现在，
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I've been thinking about this for a long time.
我已经考虑了很久了。
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