a fifth wheel 多余的人或物
But it's superfluous, really-which is why calling someone a "fifth wheel" is a way of calling them unnecessary, basically a tagalong.
但它是多余的,真的- - -这就是为什么将一个人称作“第五轮”是指他们无用,根本是个跟屁虫。
He was the only one without a date, so he felt like a fifth wheel.
他是唯一没被邀请的人,因此他感到自己很是多余。
The team already had two goalkeepers, so I felt like a fifth wheel.
队里已经有两个守门员了,我完全是多余。
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