And the key to this in every temperature, at every period -- a guide who, above all, knows when to turn back, who doesn't press on relentlessly when conditions turn against them.
这种问题的解决方法是 一个在任何温度 任何时间 都来过这个山的向导-- 一个首先 知道当条件不利时 何时该回头， 不屈不饶的向导。