ultramarathonWiktionary 原文英美构词拆解ultraultra-前缀marathonmarathon词干ultra-Greater than normal quantity or importance, as in ultrasecret. · Beyond, on the far side of, as in ultraviolet.词源说明From ultra- + marathon.释义名词noun1A running race over a distance longer than 42.195 km (26 miles 385 yard), the length of a standard marathon.同族词派生词 2ultramarathoning·ultramarathoner相关词 2