冰川行走其中一个最大的危险是雪桥断裂，接着掉进冰裂缝。

One of the biggest hazards of glacier travel is breaking through a snow bridge and falling into a crevasse.

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在南极极端严寒的气候条件下，有些冰山被自然之手打造成高耸的冰柱或带有复杂“拱桥”的巨型极地雪桥。

Others have been moulded into towering pillars of ice or giant polar Bridges with several intricate 'arches' carved into them by the harsh Antarctic conditions.

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在雪兰多河和波托马可河上都有一座桥。

There was a bridge across each river.

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