tree layer 灌木层
upper tree layer 高树层
lower tree layer 低树层
dominant tree layer 优势木层
the tree layer 乔木层
tree layer coverage 乔木层盖度
Tree layer structure 乔木层结构
As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.
随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。
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。
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。
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