这个说法主要在英国使用，其他英语国家的人会用“being the third wheel”这个词，它们的意思都差不多。
to be an unwanted third person who is present when two other people, especially two people having a romantic relationship, want to be alone
不知趣地夹在别人之间;(尤指夹在两个恋人之间)当电灯泡
I left early I didn't want to play gooseberry with you and Bev.
我提前走了，我不想跟你和贝弗当电灯泡。
（内容来自每日学英语，如有侵权请联系删除）
