fifth wheel
参考词典中fifth wheel的常规释义：
基本释义
- n.多余的事物或人
英英解释
3个名词解释
- someone or something that is unwanted and unneeded
[同] deadwood, fifth wheel - an extra car wheel and tire for a four-wheel vehicle
[同] fifth wheel, spare
show all ... (
3
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- a steering bearing that enables the front axle of a horse-drawn wagon to rotate
less ...点击查看……- someone or something that is unwanted and unneeded
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