The two halves of the main branch have grown apart.

主的左右两边各向不同的方向生长。

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，都面叫做「板」的单层细胞长出来。

The two halves of the main branch have grown apart.

主枝的左右两边各向不同的方向生长。

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.

而不论是何种羽毛，羽枝主枝延伸出来的羽小枝，都羽枝脊表面叫做「羽小枝板」的单层细胞长出来。

The two halves of the main branch have grown apart.

主枝的左右两边各向不同的方向生长。

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.

而不种羽毛，羽枝主枝延伸的羽小枝，都羽枝脊表面叫做「羽小枝板」的单层细胞长。

The two halves of the main branch have grown apart.

主左右两边各向不同方向生长。

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，主延伸出来小，都脊表面叫做「小板」细胞长出来。

The two halves of the main branch have grown apart.

主枝左右两边各向方向生长。

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.

而论是何种羽毛，羽枝主枝延伸出来羽小枝，都羽枝脊表面叫做「羽小枝板」单层细胞长出来。

The two halves of the main branch have grown apart.

主枝的左右两边同的方生长。

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.

而论是何种羽毛，羽枝主枝延伸出来的羽小枝，都羽枝脊表面叫做「羽小枝板」的单层细胞长出来。

The two halves of the main branch have grown apart.

主枝左右两边各不同生长。

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.

而不论是何种羽毛，羽枝主枝延伸出来羽小枝，都羽枝脊表面叫做「羽小枝板」单层细胞长出来。

The two halves of the main branch have grown apart.

的左右两边各向不同的方向生长。

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.

而不论是何种羽毛，羽伸出来的羽，都羽脊表面叫做「羽」的单层细胞长出来。

The two halves of the main branch have grown apart.

左右两边各向不同方向生长。

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.

而不论是何种羽毛，羽延伸出来羽小，都羽脊表面叫做「羽小」单层细胞长出来。