A Fifth-wheel的意思|示意

A mother-in-law on a honeymoon is a fifth wheel.

度蜜月时，丈母娘是个大电灯泡。

I don't like living with my son and daughter-in-law. I feel like a fifth wheel.

我不喜欢和我儿子儿媳妇一起住，我觉得我很多余。

The fifth wheel provides a solid connection point to carry the bracket quickly.

第五轮提供稳固连接点，快速接运托架。

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。

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。

My son asked me to come help at his school track meet but I felt like a fifth wheel when I got there: they already had enough people to help so I just stood there feeling useless.

我的儿子要我在他学校开运动会的时候去帮忙。可是，我到了那里觉得自己似乎是多余的，因为他们已经有好多人在帮忙，我只好站在那里没事干。