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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Climbers say it's faster (and more fun) to parachute into the valley than to hike all the way down the back of the mountain.

攀登者说，比起在山峰背后一路徒步走下去，背着降落伞跳入峡谷会快得多(也有趣得多)。

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Eventually my thought went back to the old days of the mountain.

终于乱七八糟地去想这山的远年履历。

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The road moves back and forth and around corners as it moves up the face of the mountain.

VOA: special.2010.09.08

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Plus there is a ski run that runs right down to Main Street, serviced by the Town Lift, which carries you back up to the slopes of Park City Mountain Resort.

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As each truck arrives, children jump up on to the back, and start frantically sorting through the mountain of junk, before the load has even been deposited on the ground.

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