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。
These shoes were commonly made from Birch bark, but they could also be made from linden or lime-tree bark.
这些鞋通常是用桦树皮制作，不过菩提树或者椴树树皮也能做。
These shoes were commonly made from Birch bark, but they could also be made from linden or lime-tree bark.
这种鞋通常是用桦树树皮做的，但也会用菩提树或是椴树树皮做材料。
These shoes were commonly made from Birch bark, but they could also be made from linden or lime-tree bark.
这种鞋通常是用桦树树皮做的，但也会用菩提树或是椴树树皮做材料。
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