䴙䴘目鸟类有独特的食羽行为，但对进入消化道后羽毛的功能、消化机理等存疑及争议颇多。

Grebes have a unique feather-eating behavior, but there are many suspicion and dispute on the mechanism of the digestion process and the function of feathers in the digestive tract.

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当这些小钩子与邻近羽刺上的类似结构结合在一起后，便形成了羽毛的结构网络，看似轻柔，但又异常牢固。

When these grasp on to the hooklets of neighboring barbules, they create a structural network that's featherlight but remarkably strong.

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在大气层某一定的高度以上，火箭后体上的边界层将会由于羽流引起分离。

Above some altitude within atmosphere layer, the boundary layer on after body will separate due to plume.

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