大多数的运动攀登上方都有个先锋撤退的确保站，确保站由两个耳片，可能还有一条连接绳或扁带所组成。
The vast majority of sports climbs have a 'lower off' point at the top, which may consist of two bolts and possibly a linking chain or sling.
大多数的运动攀登上方都有个先锋撤退的确保站，确保站由两个耳片，可能还有一条连接绳或扁带所组成。
The vast majority of sports climbs have a 'lower off' point at the top, which may consist of two bolts and possibly a linking chain or sling.
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