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单词 fifth wheel
释义 fifth wheel  fifth wheel  n.(名词)1. 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2. 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3. 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4. An extra and unnecessary person or thing.多余的人或物
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