Silver Birch Tree Bark 白桦树树吠声我图片
Silver Birch Tree Bark II 白桦树树吠声图片
Silver Birch Tree Bark I 白桦树树吠声我图片
The birch tree has white bark, and this tough protective outer layer of the tree, this white bark, is waterproof.
桦树有白色的树皮，树上这个坚硬的保护外层，这个白色的树皮，是防水的。
If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material.
如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。
Now besides the bark, Native Americans also used the wood of the birch tree.
现在除了树皮，印第安人还使用桦树的木材。
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