我们是两条平行的直线
[wŏ men shì liăng tiáo píng xíng de zhí xiàn]
'We Are Two Parallel Straight Lines' uses geometry as a metaphor for a lack of relationship or connection between two people, meaning they do not have any intersections no matter how long the lines extend. Thus, this can be used to imply no future possibilities or destiny to converge for a couple or friendship.