Compléter Wood textVersion en ligne Complete a text par María Pilar 1 tree Lignin external very soft tunks transparent Bark horizontal dry bushes processed raw Cellulose rigid Pith not Wood is a vegetable material . It comes from the of trees and It's composed of : - fibres , like all vegetable matter - , which makes it and hard The parts of a trunk you see whe you make a cut : - , exterior layer : it protects the plant from attack - Cambium , a thin layer - Sapwood , not strong , used for woodwork that needs wood - Heartwood , hard and , extracted and for all types of woodworking - , the centre of the trunk , very weak , generally use d
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