| 释义 |
fifth wheeln.（名词）- A wheel or portion of a wheel placed horizontally over the forward axle of a carriage to provide support and stability during turns.转向轮：呈水平方向放置的马车前轴的轮或轮的一部分，以便在拐弯时保证车子的平稳
- A similar device over the rear axle or axles of a tractor or pickup truck, serving as a coupling for a semitrailer.半拖车连接轮：置于拖拉机或拖车的后轴上的类似的设备，用以作半拖车连接轮
- An additional wheel carried on a four-wheeled vehicle as a spare.备用轮：在四轮车上作为配备品配备的备用轮胎
- An extra and unnecessary person or thing.多余的人或物
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