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If you look at the limbs what you find is that the joints are all angled
你可以看一下四肢，它們的關節都呈直角
so that the limb would have stretched out just to the sides.
所以四肢伸出來時只能貼住身體兩側
There's just no way that it could have brought its leg underneath to take any weight.
它不可能把腿放到身體下面支撐體重
Similarly with the hind limb, which we found a bit later on, similar kind of arrangement,
我們稍后發現，后肢也是同樣的情況，也有類似的結構，
no ankle to speak of, just a paddle like limb.
沒有所謂的踝部，長得和槳一樣
Acanthostega's legs would have been useless for walking
棘螈的腿根本不適合于行走
and what's more, although it was a fully formed tetrapod it could never have lived out of the water.
另外，盡管它是完全成形的四足動物，它卻不能離開水生活
It had gills just like a fish.
它長著和魚一樣的鰓
It meant the evolution of our legs could never have had anything to do with walking on land.
這意味著腿的進化應該和陸上行走毫無關系
Jenny Clack's discovery of the acanthostega had changed everything.
Jenny Clack發現的棘螈改變了一切
The old explanation that we'd evolved our legs after a fish came onto land just could not be true.
原來解釋說腿的進化發生在魚登陸之后，現在看來也并不正確
So the thing that has really changed is that rather than the fish
所以真正的演化過程并不是
going onto the land while it's, it's still got fins we've turned that completely on its head,
魚帶著鰭爬到陸地上，我們已經從根本上推翻了這一觀點
so now we've got tetrapods in the water, still in the water, while they've got limbs with digits.
我們現在認為四足動物仍舊在水中，在水里進化出腿和趾。
