情侣间的电灯泡叫做  the third wheel

I  don‘t want to be the third wheel.  我可不想当电灯泡。

如胶似漆的情侣  love birds

You wouldn‘t  want to bother any love birds.

天生一对  a match made in heaven

They are a match made in heaven. 

直觉: hunch或者 gut feeling

I have a gut feeling/hunch that ...................

随便瞎猜：take a wild guess

有根据的推测：an educated guess

英语口语积累随手记----------（1）