What does the writer mean by writing the last sentence "But, it was everything"?

作者写的最后一句话 “But， it was everything” 是什么意思？

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His last sentence may touch people's hearts: "I am young, so I can learn to think like an alien."

他说的最后一句话可能会触动人们的心灵：“我还年轻，所以我可以学着像外星人一样思考。”

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She said the last sentence quite fiercely.

她相当认真地说了最后一句话。

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The trial of Iraqi journalist Muntader al-Zaidi, who shot to fame after flinging his shoes at former President George Bush during a press conference last December in Baghdad, ended with a relatively light three-year sentence.

VOA: standard.2009.03.12

The poet and the women together become "we" in the poem's last sentence.

在诗的最后一句里“,诗人和女人成了“我们“

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I'm willing to bet that some of you had noted in your reading last night, or whenever you did your reading, perhaps you actually underlined the sentence that we've just looked like.

我打赌你们中的一些人已经在昨晚或是别的时候，的阅读中注意到，也许你们已经划出了我们刚刚看到的句子。

耶鲁公开课 - 弥尔顿课程节选

That last sentence is not contradicted by the fact that the recovery remains weak.

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And the important part of my point here is in that last sentence of the quote.

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Now, I want to draw your attention to three important words in that last sentence.

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