Naismith's rule is a rule of thumb that helps in the planning of a walking or hiking expedition by calculating how long it will take to walk the route, including ascents. This rule applies only to hikes rated Class 1 on the Yosemite Decimal System, and not to Class 2 or higher.
权威例句
1.
Walkit, a U.K. walk-routing website, adjusts for hills using Naismith's Rule, developed by William W. Naismith, a Scottish mountaineer, in 1892.
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