许多科学家仍然相信，很久以前火星上就可能存在这样的生命。

Many scientists still believe that such life may have been on Mars long ago.

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在这个混凝土，钢铁和玻璃的都市丛林中，很久以前就与大自然无缘，污染达到令人震惊的程度，生活条件极为艰苦。

Living conditions are hard in this concrete, steel and glass urban jungle, that has been cut away from nature a long time ago, with pollution reaching truly alarming levels.

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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。

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.

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And this was the reason that, long ago, In this kingdom by the sea, A wind blew out of a cloud by night Annabel Lee chilling my Annabel Lee; So that her highborn kinsman came And bore her away from me, To shut her up in a sepulchre In this kingdom by the sea.

这就是原因，很久以前，在海边的王国，夜里一阵冷风从云中吹落,冻僵了我的;,于是她高贵的亲戚到来了,把她从我身边带走，将她关进一座坟墓,在大海边的王国里。

耶鲁公开课 - 1945年后的美国小说课程节选