The two halves of the main branch have grown apart.

主枝的左右两边各向同的方向生长。

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.

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.

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.

主枝的左右两边各不同的方。

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。

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。

The two halves of the main branch have grown apart.

主枝的左右向不同的方向生长。

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.

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。