inner-bark borer [植保] 内皮害虫
Then the young larvae drill into and feed on the inner bark.
它放置幼卵在树皮上，然后幼虫钻入树皮中长大。
The most popular material is the inner bark of the paper mulberry tree.
最流行的材料是纸桑的内层书皮。
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。
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