美国岩石力学协会 American Rock Mechanics Association
美国的岩石园学会 the americanrock garden socity
美国的岩石力学协会 american rock mechanics association
美国葡萄酒的岩石之心 ROCKY HERAT
1969年，美国一侧的瀑布被断流以研究瀑布底部的岩石堆积。
The American side of the falls were shut off in 1969 to study the buildup of rock at the base of the falls.
靠近地球的9号探测器和其他俄罗斯着陆器所看到的岩石图，暗示了一段痛苦的火山历史，这一点在上世纪90年代初得到了美国麦哲伦轨道飞行器的证实。
The rocky views glimpsed by the Nearer Nine and other Russian landers suggested a tortured volcanic history that was confirmed in the early 1990s by the American Magellan orbiter.
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。
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.
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