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.

而论是何种毛，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。

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.

而不论是何种毛，主延伸出来的小，都脊表面叫做「小板」的单长出来。

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.

而不论是何种毛，从主延伸的，从脊表面叫做「板」的单层细胞。

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.

而不论是何种毛，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。

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.

不论是何种毛，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。

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.

而不论是何种毛，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。

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.

而不论是何种毛，从主延伸出来的，都从脊表面「板」的单层细胞长出来。

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.

而不论是何种毛，从主延伸出来的，都从脊表面「板」的单层细胞长出来。

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.

而不论是何种毛，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。