a fifth/third wheel idiom US
汽车上挂拖车的轮子;拖车
a wheel on a vehicle to which you attach a trailer, or the trailer itself
冗员，不需要的人；无足轻重的人
someone who is in a situation where they are not needed or are ignored by most people
江苏热线英汉汉英双解词典包含207361条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。