英语词汇fifth wheel怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	fifth wheel
释义	fifth wheeln. 1 an extra wheel of a coach (四轮大马车的)备用轮 2 a superfluous person or thing 多余的人(或物) 3 a horizontal turntable over the front axle of a carriage as an extra support to prevent its tipping (马车的)转向轮；(半拖车的)支座轮
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