In fact, lovers give each other cups simply because of its representative meaning "cup". "Cup" is homophonic with a word "generation", which represents the meaning of life. Of course, this is only superficial. In fact, it is very meaningful to send a cup.
If the relationship between two people has not been established, there is a trace of love and pursuit. If the relationship has been established, it is a good wish between lovers. I'll give you a drink and accompany you for life.
Besides being very practical, cups have more special meanings. A glass of water shows your deep friendship with each other! If you receive a "friend's" cup, it means that people regard you as a lifelong friend.
Sending cups with the same sound as "generation" between teachers and students and sending people older than themselves can better show respect for teachers and have a far-reaching impact.