First: the position of the first bolt invariably leads to a greater Angle in the rope as the belayer stands away from the vertical plane.
第一：因为保护者站在离开岩壁的地方，第一把快挂总是导致通过它的绳子弯曲成很大的拐角。
2
Alternatively drop from bolt to bolt until there is enough rope to lower off!
也可以从一个又一个耳片下降，直到有足够的绳子可以做先锋撤退。
3
The main product has followed several types: Z1 type (stone soil, take the stone as the major and stone collapsed) : Bolt, support rope, steel mesh, the grid network.