Zhu Qing's explanation.

The explanation of bamboo green is a turquoise skin on the outside of bamboo. Culture and Life 1982No. 1: "The so-called green retention means to keep a layer of carved bamboo green on the surface of bamboo, and shovel off the bamboo green outside the pattern to expose the bamboo muscles below the bamboo green."

Word decomposition

Interpretation of bamboo → Evergreen perennial, bamboo shoots are born in spring, with knobby stems, hollow middle, hard texture and various types. It can be used as both utensils and building materials: bamboo. Bamboo leaves. Bamboo shoots. Bamboo weaving (handicraft woven with bamboo strips). Bamboo carving. Refers to bamboo wind instruments: stone, silk and bamboo. Interpretation of Eight Tones of Ancient Musical Instruments in China: Green: Dark Green or Light Blue: Turquoise. Green grass. Moss. Young crops. Vegetables Onion. Green mountains and green waters. Reach the summit. Eternal and unchanging. Green things: hiking. Green and yellow don't connect. Indigo: Indigo. Violette. Shine on you more than blue.