Pterosaurs also had a wing membrane that was supported by just one finger.

翼龙也有一个仅由一根手指支撑的翼膜。

You see, pterosaur wings have  an elongated 4th digit that would have supported most of the wing membrane.

你看，翼龙的翅膀有一个细长的第四指，可以支撑大部分的翼膜。