The snow-covered peaks of Chacaltaya Mountain tower over the Bolivian capital, La Paz, rising 17, 800 feet above sea level.

白雪皑皑的恰卡塔雅峰顶要高出玻利维亚首都拉巴斯许多，这座山峰的海拔高度在17800英尺（5425米）。

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A ski resort in Bolivia's capital, La Paz, the highest in South America, closed several years ago because of the retreat of the Chacaltaya glacier.

另外，由于恰卡塔亚（Chacaltaya）冰川的消退，南美洲海拔最高的城市——玻利维亚首都拉巴斯的一个滑雪胜地在几年前被迫关闭。

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Starting July 12, they will test the same participants at Bolivia's Mount Chacaltaya, at 17, 200 feet.

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

Some scientists say the Chacaltaya glacier in Bolivia, which used to be the world's highest ski run, has already nearly disappeared.

BBC: Massive melting of Andes glaciers