What does it mean to ride a bamboo horse to pick green plums?

Childhood sweethearts, comes from one of Tang Li Bai's "Changgan Xing": "The man came riding a bamboo horse and went around the bed to make green plums. Living together in Changgan, the two children had no doubts." Later described as "childhood sweethearts" The childhood sweetheart situation between boys and girls. Scene 4 of "The Peacock Flies Southeast" by Ouyang Yuqian: "You and I have been in love since we were young, and we were childhood sweethearts." 1. Green plum: green plum; bamboo horse: children use bamboo poles as horses to ride. Describe the appearance of children playing innocently and innocently. The phrase comes from one of Tang Dynasty's "Changgan Xing": "The man came riding a bamboo horse and went around the bed to make green plums. Living together in Changgan, the childhood sweethearts guessed." Later, "childhood plums and bamboo horses" were used to describe the childhood sweethearts between boys and girls.