翼龙的每个前肢都有一根长长的第四指，支撑着像翅膀一样的膜。
In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing-like membrane.
飞行能力一共有四次的进化突破：昆虫是三亿年前进化过来的，翼龙是二亿三千万年前进化的，鸟类是一亿万千万年前进化的，而蝙蝠是五千万年前进化的。
It has evolved only four times: among the insects about 300m years ago, the pterosaurs (230m), the birds (150m) and the bats (50m).
相反，他说翼龙使用它所有的四肢向前跑动，从而使自己飞到空中。
Instead, he says a pterosaur used all four limbs, leapfrogging forward on its knuckles, to propel itself into the air.
翼龙足迹为四足行走，行迹宽。
他说翼龙需要使用它们所有的四肢来起飞。
Instead, he says that pterosaurs needed all four limbs for liftoff.
当翼龙走路或静止时，第四指及其翼，只能向上翻转，成一个伸展且内翻的V型，在其身体两侧。
When a pterosaur walked or remained stationary, the fourth finger, and with it the wing, could only turn upward in an extended inverted V-shape along each side of the animal's body.
当翼龙走路或静止时，第四指及其翼，只能向上翻转，成一个伸展且内翻的V型，在其身体两侧。
When a pterosaur walked or remained stationary, the fourth finger, and with it the wing, could only turn upward in an extended inverted V-shape along each side of the animal's body.
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