流过鸟翅膀的空气在翼尖后向上流动，这种现象被称为上升流。
The air flowing over a bird's wings curls upwards behind the wingtips, a phenomenon known as upwash.
第二种假设似乎不太可能，因为大型翼龙不可能在不损害翅膀的情况下降落在树上。
The second hypothesis seems unlikely because large pterosaurs could not have landed in trees without damaging their wings.
猩红的翅膀到了翼端渐变成浅红。
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