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
plant community under tree-layer 林下植物群落
Layer Tree 图层树 ; 层树
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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