Nodes are between bamboos.
(Note: "case"-word. "Festival"-integrity and moral integrity; Bai Juyi's "Bamboo Cultivation" said: "The bamboo heart is empty, and the empty body is the Tao. A gentleman sees his heart and thinks about the virtual recipient "; The bamboo nodes of bamboo extend as a whole; The cold tolerance and evergreen of bamboo are regarded as "unyielding"; The height of bamboo is considered as "towering"; The comeliness and elegance of bamboo is extended to "gentleman". )