羽轴

鸟羽毛的羽轴一般是中空的。

The stem of the bird feather is usually hollow .

从主羽轴突出的平行丝状体中的一缕。

One of the parallel filaments projecting from the main shaft of a feather .

羽毛所属部分，已经清洗、消毒或防腐以外的加工（不包括经过加工的羽管、羽轴）

Feather , parts of , worked beyond cleaning , disinfection or preservation ( excl. worked quills or scapes )

某些鸟类的某些羽轴根部下面的羽毛（通常细小）。

A supplementary feather ( usually small ) on the underside of the base of the shaft of some feathers in some birds .

如果你仔细观察照片以上，你会发现有一些黄色的对象低于羽轴。

If you take a close look at the photo above , you would find that there are some yellow object below the feathering shaft .

由于它的羽轴粗大，大部分科学家都认为始祖鸟会飞，但最新发现的腿部羽毛可能对它的飞翔并不起多大作用。

Thanks to its thick feather-shafts , most scientists do think Archaeopteryx could fly , but the newly discovered leg feathers wouldn 't have played a great role in that .

除羽轴外，飞羽的多级羽枝特征尺寸都在微米量级，属于微尺度力学性能测试的范畴。

In addition to the rachis , the feature sizes of multi-level flight feathers barbs are in micron dimension . So the test of barbs is belonging to the category of microscale mechanical testing .

同样的，绒羽的羽枝簇比拥有羽轴的正羽更早演化出来，因为羽轴是由羽枝脊接合而成。

Likewise , a plumulaceous tuft of barbs evolved before the pennaceous feather with a rachis because the rachis is formed by the fusion of barb ridges .

模拟发现，轴对称羽流的平均径向速度小于平面羽流，且轴对称羽流的涡旋变化频率高于平面羽流，涡量值明显低于平面羽流。

The results show that the averaged radial velocity and vorticity of axisymmetric plume is lower than that of planar plume , while frequency is higher than that of planar plume .