A third wheel 電燈泡
A: Hey! I have an engagement with my girlfriend tonight, why not have dinner with us?B: You two go on ahead. I don't want to be a third wheel.A: 嘿!我和我的女朋友今晚有約會,你跟我們一起吃飯吧?B:你們兩個去吧!我可不想當電燈泡。
"a third wheel",意為 “電燈泡,第三者”。
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