Naivety is an idiom in China, which means to describe the innocence of a person's age. From Song's work "In the Garden": "Laugh in front of the flowers, childlike innocence, and follow the group."
Naivety refers to those who have children's special mentality, emotions, personality and interests. Their innate childlike innocence complex has always maintained a sense of resistance to the steel forest. Even if the appearance is inevitably mature, you should keep a corner of the child in your heart.