• 1. a fifth wheel: 多余的人或物
• 2. A Fifth-wheel: 没用的人

• 1.A mother-in-law on a honeymoon is a fifth wheel.
  度蜜月时，丈母娘是个大电灯泡。
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• 2.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。
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• 3.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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