What do you mean I'm laughing?

My smile is a homophonic stalk, which means "the punchline is low". There is an interesting story behind this stalk: it is said that a boy was ill and went to the hospital for intravenous drip. As a result, he kept laughing hysterically. The doctor asked him why, and he replied that because he saw a drip, the homonym was "laughing", which means laughing low. Later, this stalk was simplified to "I smiled a little", which can be used to describe a person's low laughter, or to describe a person who feels funny after hearing or seeing something, or to describe a person's low laughter.