In both types of feather, the barbules that extend from the barb ramus grow from a single layer of cells, called the barbule plate, on the periphery of the barb ridge.
而不
种
毛，从枝主枝延伸出来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长出来。
小支In both types of feather, the barbules that extend from the barb ramus grow from a single layer of cells, called the barbule plate, on the periphery of the barb ridge.
而不种毛，从枝主枝延伸出来的小枝，都从枝脊表面叫做「小枝板」的单层细胞长出来。
声明：以上例句、词性分类均由互联
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