The poet of the Tang Dynasty came from one of Li Bai's Long March 1: "When you, my love, ride a bamboo horse, run in circles and throw your childhood. We live together in an alley in Changgan, and we are all young and happy. "
Later, "childhood friends" were used to describe the situation between boys and girls.
Li Bai, a poet in the Tang Dynasty, described in the poem Long March that there were two families living in Changganli Street, the ancient city of Jinling, both of whom had children. They played together since childhood, and the boy went out happily riding a bamboo pole as a horse. When the girl saw many plums growing on the plum tree, she asked the boy to pick them, and the boy picked many for her. Their feelings are pure and deep, without any doubt. Then the two children grew up and got married.
To put it simply, a boy and a girl grew up together, with deep feelings and purity.