The germinating bamboo shoots are buried in the ground in winter, waiting for the arrival of spring. The first rain of spring awakens the bamboo shoots. Bamboo stems are commonly used as building materials in East Asian countries. The structure of bamboo is divided into three parts from dense to sparse: bamboo green, bamboo meat and tabasheer, which constitute the bamboo wall, and the bamboo wall has a hollow structure divided into sections inside. Such structure preserves the bamboo's rigidity and the material's toughness.