Mountain climbing sports technical terms. One of the basic technologies. It is mainly used in rivers where the mountain stream is at the front end, the water depth, and the tip of the river, the water temperature is low and the river is not very wide. First tying the traction rope to one end of the river, one wading or bypassing the river upstream, and fixing the other end of the rope to the lower trunk or the ground on the other side of the river. The successor will slide on the traction rope with a pulley or iron lock to cross the river.
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