Backpressure: good in theory, broken in practice
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。新收录的资料对此有专业解读
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The mountaineers BBC News spoke to largely agreed that while the most experienced climber should be expected to take the lead when they climb in a group, everyone involved takes on an inherent risk when they decide to go into the mountains. "You're choosing to take a risk that you don't have to take," says Zoe Hart, a mountain guide in France.
，更多细节参见新收录的资料
Go to worldnews。业内人士推荐新收录的资料作为进阶阅读
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