| 单词 | fifth wheel |
| 释义 | fifth wheel n. 1. a. A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns. b. A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer. 2. An additional wheel carried on a four-wheeled vehicle as a spare. 3. An extra and unnecessary person or thing. |
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