ul·tra·mar·a·thon 
(ŭl′trə-mărə-thŏn′)
(ŭl′trə-mărə-thŏn′)n.
A cross-country footrace longer than a traditional marathon (26 miles, 385 yards).
ul′tra·mara·thon′er n.
| 单词 | ultramarathon |
| 释义 | ul·tra·mar·a·thon (ŭl′trə-mărə-thŏn′)n. A cross-country footrace longer than a traditional marathon (26 miles, 385 yards). ul′tra·mara·thon′er n. |
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