The explanation of acorn surface is that acorns are ground into powder. It can satisfy hunger and has bitterness. Yang Shuo's Haicheng: "My family suffers from acorn flour until the five grains are ripe." Chapter 12 of Gao Yubao's Gao Yubao: "In the years since I left my hometown, I have eaten acorn powder." The explanation of decomposing the word oak is that "oak [rubber tree] is an evergreen tree with slender branches, three oval leaflets forming compound leaves, white flowers and spherical capsules." The abbreviation is "rubber", such as "rubber". ? ) tree ". The abbreviation is "oak", such as "acorn" (the fruit of an oak tree). Number of strokes:; Radical: wood;