Natural protection should be used for belay anchors where at least2, preferably3, independent bombproof anchors can be used. 2于天然支点上,应使用确保固定点,同时,该处应能使用至少两个极稳固的固定点,三个更好。
bombproof
[ noun ]
a chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids
<noun.artifact> [ verb ]
make safe against bombings
<verb.change> [ adj ]
able to resist the explosive force of bombs and shells
<adj.all> bombproof shelter
Bombproof \Bomb"proof`\, a. Secure against the explosive force of bombs. -- n. A structure which heavy shot and shell will not penetrate.