Recent work on the problem of when people first entered the Americas is an example of the value of these new techniques.

关于人们何时首次进入美洲这一问题的最新工作就是这些新技术的价值的一个例子。

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When people first jump on an ebike, their face lights up.

人们第一次骑上电动自行车时脸上洋溢着快乐的光芒。

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Now, again, there's a great debate about when the Clovis people first arrived in the Americas.

现在，关于克洛维斯人是什么时候第一次来到美洲又有了一个很大的争论。

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But we're trying to keep responsible homeowners in their homes, and keeping mortgages affordable for middle-class people and first-time homebuyers -- as we're going to hear a little bit from Joe.

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