They're an extinct group of flying reptiles that are more closely related to dinosaurs

它們是已滅絕的飛行爬行類動物，與恐龍的關係更為密切

and birds than they are to any other reptile. Pterosaurs first appear about 225 million

與其他爬行動物相比，翼龍更像鳥類。翼龍最早出現於大約 2.25 億年前。

years ago, and become extinct about the same time that avian dinosaurs did, about 65 million

在大約6500萬年前，鳥類恐龍也滅絕了。

years ago. There are two broad categories of pterosaur

年前。翼龍有兩大類

body plan. Early pterosaurs tended to have long tails,

身體結構。早期的翼龍往往有長長的尾巴、

relatively short heads, and relatively short limbs.

頭相對較短，四肢相對較短。

The later pterosaurs tended to have very short tails, longer limbs when standing on the ground,

後來的翼龍往往尾巴很短，站在地上時四肢較長、

and very large heads and necks. In recent years, there have been several trackways

以及非常大的頭部和頸部。近年來，有幾條足跡

that have been found, and that we could refer to pterosaurs.

我們可以把已經發現的翼龍稱為翼龍。

The main reason for that is because pterosaurs have a particular morphology of their hands

主要原因是翼龍的手有特殊的形態

and their feet, and you could see them replicated in those trackways. And those trackways showed

和它們的腳，你可以在這些足跡中看到它們的複製品。這些足跡顯示

us that they moved on the ground using all four limbs.

我們發現，它們用四肢在地面上移動。

Pterosaur research is an ongoing process, and we have a lot of new discoveries and a

翼龍研究是一個持續的過程，我們有很多新的發現，也有很多新的挑戰。

lot of new aspects that we might learn in the future.

我們將來可能會學到很多新的知識。