A third wheel 电灯泡
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约会,你跟我们一起吃饭吧?B:你们两个去吧!我可不想当电灯泡。
"a third wheel",意为 “电灯泡,第三者”。
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