问题是，没有人知道究竟需要有多少鲤鱼进入湖中才能建立一个无法逆转的立足点。
The problem is that no one knows how many carp need to make it into the lake to establish a foothold that can't be turned back.
这种保护方式在没有合适的立足点时使用，通常用于困难的多段攀登中。
Hanging belays are done when there is no suitable ledge or foothold available. Most often done on difficult, multi-pitch climbs.
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