two-faced 两面派
A two-faced person will say nice things about you to your face, and tell others nasty things about you when you're not around.
两面派的人当面说你好话，而背着你的时候就说你坏话。
Two-faced people are usually back stabbers.
两面派也通常都会在别人背后下刀子。

third wheel 妨碍情侣约会的电灯泡
I'd love to go out with you,but I hate to be a third wheel.
我想和你们一块出去,可我不想当电灯泡.
If you bring your girl, I'll have to take my cousin with me--I don't wanna be the third wheel.
如果你带女朋友,我就得带上我表妹,我可不想当孤零零的电灯泡.

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