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 complementary coastlines and certain geological features that seem to span the ocean are reminders of where the two continents were once joined.

互相吻合的海岸线和某些似乎跨越海洋的地质特征会使人想到这两个大陆曾经是连在一起的。

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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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