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Make sure you buy a good pear-shaped locking carabiner ( either screw-gate or locking-gate type ).
要确定你买的是个梨形锁,带丝扣的或自动锁的都可以.
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The carabiner must not be obstructed, any pressure from the rock reduces its strength.
锁不能被岩石或者挂片阻碍, 任何来自岩石的压力都会降低锁的强度.
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