Today, the typical feather consists of a central shaft, called a rachis, with serial paired barbs forming a flat, curved surface, which is called a vane.

今天，典型的羽毛包含一轴（称为羽轴），还有连续成对的羽支形成平坦弯曲的表面，这被称为叶片。

The central part of the feather became a hardened structure called a rachis, with lots of little barbs and barbules, creating the vanes of the feather.

羽毛的央部分变成了一种称为羽轴的硬化结构，上面有许多和枝，形成了羽毛的叶片。

So where you see a typical flight feather that has a closed vein and an offset rachis to give it an aerodynamic airfoil shape, the ostrich is have done away with that completely.

所以如你所见这是一典型的飞行羽毛，有一封闭的静脉和一偏移的羽轴给它一符合空气动力学的翼型形状，鸵鸟已经完全失去了这种羽毛了。