By the early part of the twentieth century, scientists believed that four distinct glaciations had affected North America and Europe during the Pleistocene epoch.

到二十世纪初，科学家们认为，在更新世期间，有四次不同的冰川作用对北美和欧洲产生了影响。

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The people we see now have three or four part-time jobs and they're still right on the edge financially.

我们现在看到的这些人有三到四份兼职工作，但他们依然经济拮据。

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Twenty-four people are now getting ready to be a part of the third.

目前，有24人正准备成为第三批的一员。

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It began as part of the effort for the United States to hold the nineteen ninety-four World Cup competition.

VOA: special.2010.06.02

As we come back in to this, I think we've got a situation where the piano keeps playing the four-note motive, the part like he was building it up for tension.

回到这里,我想情况是这样的,钢琴一直弹奏着四音节的动机,这个部分像是钢琴在制造紧张气氛

耶鲁公开课 - 聆听音乐课程节选

Four of the five marmosets born as part of the experiment carried the foreign gene in several kinds of tissue.

VOA: special.2009.06.23

For an inspiring tale of how some of these unsung heroes overcame the most daunting physical challenges of their age, see the four-part documentary Great Projects, to be shown on public television this summer in four one-hour segments.

FORBES: American Pyramids

In the last of our four-part Beyond the Balance Sheet series, we review one consultant's scorecard on how big corporations act as citizens.

FORBES: Benchmarking Benevolence

Then, flash forward to present again for forty five minutes before jumping back to the past for the better part of four hours, nearly the entire rest of the game.

FORBES: God of War: Ascension Review - Teaching an Old Kratos New Tricks