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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Five Canadian climbers were saved yesterday, after they had spent five days high up on K2, the second tallest mountain in the world.

在世界第二峰K2山上被困了五天后，五个加拿大登山队员于昨天获救。

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

VOA: special.2009.12.09

All too often Everest hits the news for the wrong reasons - climbers left to die high on the mountain, or piles of rubbish littering the slopes - but for Luanne such rescues show the spirit of Base Camp.

BBC: NEWS | Health | The highest hospital in the world

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

The mountain's summit stands at 8, 848 metres high, and beyond 7, 600 metres climbers enter what is known as the "death zone" - so called because of the serious effects of oxygen deprivation on the body.

BBC: Climber abandons Everest attempt