Yet despite its high cost, creatures ranging from ground dwellers to tree climbers and even flyers do it.

尽管这些花费过多，从地上居的到树上爬的，甚至天上飞的动物们都会去做。

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The climbers gazed down from on high.

攀登者从高处向下俯瞰。

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Mountain climbers often carry oxygen tanks because the air is very thin at high altitudes.

登山者通常会携带氧气筒，因为在极高的地带空气相当稀薄。

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Climbers have to pull themselves straight up the face of very high rocks or walls.

VOA: special.2009.12.09

The team also is focusing on why climbers at high altitude experience poor sleep.

WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body

There have been greater numbers of climbers at high camps waiting to attempt the summit, Dr. Johnson says.

WSJ: Mayo Clinic Researchers on Everest Study High Altitude's Effects on the Body

By means of steel cables and iron brackets anchored into rock faces, climbers reach a high-altitude world that would otherwise be seen only by hardened alpinists.

BBC: Ten weekends in Europe's great outdoors