The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.

美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。

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However, in the late 1980s, some scientists were exploring Devil' s Hole, which is basically an extensive water-filled cave, far from the ocean, in Nevada2, in the western United States.

然而，在20世纪80年代后期，一些科学家在美国西部的内华达探索魔鬼洞，这基本上是一个广阔的充满水的洞穴，并且远离海洋。

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Now there are some pretty interesting caves in parts of the western United States, especially in national parks.

现在在美国西部的一些地方有一些非常有趣的洞穴，尤其是在国家公园里。

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There used to be a time when the quickest way to travel across the western United States was in a stagecoach.

VOA: special.2010.04.26

Western countries, and especially the United States say, "We have a big pharmaceutical industry that develops new drugs.

西方国家，尤其是美国宣称，我们拥有研发新药品的大制药业。

耶鲁公开课 - 公正课程节选

In the 1830s 600,000 immigrants came to the United States, almost entirely from Western Europe; in the 1840s alone 1.5 million; and in the 1850s,almost 3 million more.

十九世纪三十年代,约有六十万人移居美国,几乎全部来自西欧,仅在四十年代,就有一百五十万移民,而在五十年代,又多了三百万

耶鲁公开课 - 美国内战与重建课程节选

Coastal residents of the western United States should hunker down for a smoggy summer and fall, NASA scientists say.

CNN: Western U.S. to get smoggy summer, fall

Tropical wildfires are different from the ones that happen in temperate woodlands, for example in the western United States.

ECONOMIST: A new experiment is setting the Amazon on fire

On the one hand, there's a hope that issues specific to the Western United States will suddenly become prominent.

NPR: Presidential Race Comes Early to Primary States