1.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，典型的羽毛包含个中心（为羽），有连续成对的羽支形成平坦弯曲的表面，这被为叶片。

2.Then we're going to have to say, the number, weight or volume of the berries per centimeter of rachis and three again.

然后我们不得不说出每厘的浆果数量、重量或体积，然后再说三个。机翻

3.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.

羽毛的中央部分变成了为羽的硬化结构，上面有许多小倒钩和小枝，形成了羽毛的叶片。机翻

4.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.

所以如你所见这是个典型的飞行羽毛，有个封闭的静脉和个偏移的羽给它个符合空气动力学的翼型形状，鸵鸟已经完全失去了这羽毛了。