When laughing on a formal occasion, stress or the following behaviors and performances: (1) smirk A smirk, that is, a smile is false, and the smile does not laugh. It has the principle of authenticity that is contrary to laughter, and it is a measurable value. (2) sneer Sneering is a smile that contains anger, irony, dissatisfaction, helplessness, disdain, disapproval, and so on. This kind of laugh is very easy to make people hostile. (3) strange laugh It’s strange to laugh, that is, it’s strange to laugh, it’s numb. It contains a lot of intimidation and ridicule, which is very repugnant. (4) Meixiao Laughing, that is, deliberately please others' smiles. It is also not from the heart, but from a certain utilitarian purpose. (5) sneer Laughter, that is shy or laughter. For example, when laughing, cover the mouth with the palm of your hand, do not dare to communicate with others, and even face red and incoherent. (6) Snickers Snickers, that is, secretly laughing. More expressions of self-satisfaction, gloating or watching other people's jokes. (7) Laughter Laughter, that is, when you laugh, your face is fierce. More expression of anger, panic, scare others. This kind of smile has no beauty at all.