Our generation once joined hands and stood firm at times of national emergency.

在国家危急时刻，我们这一代人曾经携手合作，坚定立场。

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You know the theory that earth's continents were once joined together and only split apart relatively recently?

大家都知道地球上的大陆曾经连在一起，直到最近才分开的那个理论吗？

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The fact that he once joined the army is believable.

他曾当过兵这一事实是可信的。

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Young Sunnis who once joined the insurgency are now joining the army and police.

CNN: Text of President Bush's speech

For instance, once Palin joined the ticket, the theme of the GOP convention went from experience to reform.

CNN: Commentary: Fighting words from McCain and Palin

Once I joined the company, I took on several different challenges.

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