“多余的人或电灯泡”用英语表达口语是 third wheel 或 fifth wheel，寓意：
1、a person who is in a situation where they are not needed
处于不被需要的情况下的人
2、an extra and unnecessary person or thing
多余的和不必要的人或物
例如：
1、I was the only person at the dinner party without a date. I felt like a third wheel.
我是宴会上唯一没有约会的人。我觉得自己是多余的人。
2、I felt like a fifth wheel when I couldn't speak English well with my English teacher.
当我不能用英语很好地跟我的英语老师交流时，我感觉自己是多余的人。
3、I'm going, I don't want to be a fifth wheel.
我要走了，我不想当电灯泡。
4、I quit my bank job and am preparing for civil service. Now I feel like I am a third wheel.
我辞去了银行的工作，准备当公务员。现在我觉得自己是一个多余的人。
5、The way I live my life, I always feel like a fifth wheel.
我的生活方式，总让我觉得自己是个无足轻重的人。
解析：the way 作先行词，在定语从句中作状语，有三种引导方式：the way in which，the way that 和 the way.
6、I didn't realize that the party was for couples only, so when I showed up alone, I felt like a fifth wheel.
我没有意识到这个聚会只为情侣们举办，所以当我一个人出现时，我觉得自己像个无足轻重的人。
7、I don't like living with my son and daughter-in-law. I feel like a fifth wheel.
我不喜欢和我的儿子和儿媳住在一起。我觉得自己像个电灯泡。
8、When Kelly invited me to go to the movies, I didn't know that her boyfriend would be joining us. I felt like a third wheel the entire night.
当凯利邀请我去看电影时，我不知道她的男朋友会和我们一起去。整个晚上我都觉得自己像个电灯泡。
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