n.前肢
At most, their forelegs grow vestigial spurs where wing membrane might have been. 最終，它們本應(yīng)長為翅膀的前肢會退化為薄膜。
Immediately behind the shoulders ribs are flattened enough to allow free movement of the forelegs, becoming rounder behind. 肩胛后面的肋骨立即變平，允許前肢能自由運(yùn)動，隨后逐漸變圓。
