What does Mu Mu mean?

Wood is a lignified tissue, which is formed by plants that can grow twice, such as trees and shrubs. After the primary growth of these plants, the vascular cambium in the roots began to move, developing phloem outward and wood inward. Wood is a general term for the inward development of plant tissues from vascular cambium, including xylem and wood filaments. Wood is the product of forest owners and plays a huge supporting role in human life. According to different properties and characteristics of wood, people use them in different ways.