QY: Happy Friday，Donny! 你今天晚上有什么计划吗？
Donny: Hmm, not yet. What do you have in mind?
QY: Let's go salsa!! 我今晚要跟两个朋友去跳salsa, 可他们俩是一对，我可真不想夹在中间，当大电灯泡--very bright light bulb!
Donny: I see. You don't want to be the third wheel.
QY: The third wheel?
Donny: Yep! Wheel is spelled w-h-e-e-l. The third wheel, 第三个轮子, it's a very colloquial way of saying a third person joining a couple in a social context.
QY: 没错！我就是不想当the third wheel!
Donny: Exactly, you wouldn't want to bother any love birds, right?
QY: Wait! love birds? 爱的鸟儿？
QY: 可不是吗！不过这两个人很配！They are a GREat match!
Donny: Oh that's nice! You can also say, they are a match made in heaven.
QY: A match made in heaven？那不就是中文里说的天生一对嘛！
Donny: There you go! Since you don't want to be the third wheel, I will go with you! But first, let's see what you learned today!
QY: 第一：电灯泡叫做：the third wheel;
第三，"天生一对"是，a match made in heaven.