a metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold
piton详细解释
pi.ton n.Sports （名词）【体育运动】 A metal spike fitted at one end with an eye for securing a rope and driven into rock or ice as a support in mountain climbing.钢锥：一头有眼可固定绳索的金属锥子，钉在岩石或冰中可助登山之用 来源：French 法语 from Old French [nail] 源自 古法语 [钉]
