单词 | Naismith's rule |
释义 | Naismith's rule(ˈneɪsmɪθs) noun mountaineering a rule of thumb for calculating the time needed for a climbing expedition, allowing 1 hour for every 3 miles of distance plus 1 hour for every 2000 feet of height Word origin C19: named after W. W. Naismith (1856–1935), Scottish climber, who formulated it |
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