mountain biking
US /ˈmaʊn.tɪn ˌbaɪ.kɪŋ/
UK /ˈmaʊn.tɪn ˌbaɪ.kɪŋ/

1.
산악자전거, 산악자전거 타기
the sport of riding bicycles off-road, often over rough terrain, using specially designed mountain bikes
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We went mountain biking in the Alps last summer.
지난 여름 알프스에서 산악자전거를 탔어요.
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Mountain biking requires good balance and stamina.
산악자전거는 좋은 균형감각과 체력이 필요하다.