单词 | walking wheel |
释义 | walking wheel/ˈwɔːkɪŋ ˌwiːl/noun 1An instrument consisting of a wheel with a handle by which it may be rolled along the ground to measure distances on foot; a measuring wheel. 2A large vertical wheel which is turned by people or animals walking on the inner or outer rim, used as a source of mechanical power; a treadwheel. Compare treadmill. Now historical. OriginEarly 18th century. From walking + wheel. |
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