Tan90 is a mathematical value called "infinity", which translates as "there is no number that exceeds this limit" or "the limit is always outside the number you quoted", that is, a value that can never be obtained.

So this sentence means to like someone, but even if you like them, it is impossible to continue to develop, that is, it is impossible to make a positive result, or it is impossible to be together. Although two people will have an intersection, although they will transcend all emotions, love will not happen.

Spread the data above friends and below lovers, a rare lovely attribute, childhood friends with unusually good relationships, or lovers who often act together and have warm feelings.

You can have intimate interaction that ordinary friends can't do, and the eyes of two people will become more ambiguous, rather than the intimate relationship between friends and lovers. When one party forcibly breaks through and makes an overly intimate move, it may cause unexpected adverse effects, and the relationship between the two will quickly cool down and become an ordinary friend relationship or even an embarrassing relative situation. We must pay attention to it.

Sometimes, this relationship will last forever, perhaps because I just want to keep the perfect side of each other in my heart.