Crevasse rescue is one of the more complicated mountaineering techniques, sometimes requiring pulley systems and multiple haul lines.
裂缝救援是一项更副复杂一些的登山技术，有时候需要滑轮组和多组拖曳绳。
Crevasse rescue is one of the more complicated mountaineering techniques, sometimes requiring pulley systems and multiple haul lines.
裂缝救援是一项更副复杂一些的登山技术，有时候需要滑轮组和多组拖曳绳。
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