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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They're a type of rodent who, who burrow in the ground in the grasslands of the western United States and Mexico.

它们是一种啮齿类动物，在美国西部和墨西哥草原的地上挖洞。

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Wildfires are becoming an increasing menace in the western United States, with Southern California being the hardest-hit area.

森林大火对美国西部的威胁越来越大，其中南加州是受灾最严重的地区。

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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