bouldering
noun [ U ] uk/ˈbəʊl.dər.ɪŋ/ us/ˈboʊl.dɚ.ɪŋ/
攀岩（运动）
an activity in which people climb up and over rocks at fairly low heights without using ropes
His adventurous-spirited mother loved skiing, hiking, and bouldering. 他的母亲充满冒险精神，喜欢滑雪、徒步旅行和攀岩。