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Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.

撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。

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He pulled out this dusty old rock tumbler.

他拖出了这个布满灰尘的旧磨石机。

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Today we explain a very old saying that has had a big influence on rock-and-roll music.

VOA: special.2009.06.21

Plans are also underway to introduce wildlife photography sessions and rock climbing at the 2, 400-year-old rock-cut Kanheri Caves later this year.

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Josh Koenig, an 18-year-old rock-climbing enthusiast, had both his mother and his girlfriend encouraging him to take pictures with Mr. Cole's Denver studio.

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The 26-year-old rock 'n' roller suffers from cystic fibrosis, which fills her lungs with bacteria-infested mucus.

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