他们在国家公园的中央扎营，远离所有城镇。

They camped in the middle of a national park, far from any towns.

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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。

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

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后来，在希尔的呼吁之下，国家公园和绿化带得以建成。

Hill's pressure later led to the creation of national parks and green belts.

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