Three were meat-eaters and the ancestors of large meat-eaters like T. Rex and Giganotosaurus.

其中三种是肉食动物，也是大型肉食动物，比如特雷克斯龙和巨齿龙的祖先。

This next one is from Giganotosaurus.

下一个来自 Giganotosaurus。

Giganotosaurus had a much longer skull and lower jaw than those of Tyrannosaurus Rex.

南方巨兽龙的头骨和下颚比霸王龙长得多。

Notice how the Giganotosaurus' tongue bounces when it opens its mouth, or how its skin reacts when it roars.

注意 Giganotosaurus 的舌头在张开嘴时如何弹跳， 或者它的皮肤在咆哮时如何反应。

This is a jaw of Tyrannosaurus Rex, and this is the jaw of another gigantic predator known as Giganotosaurus.

这是霸王龙的下颚，这是另一种被称为南方巨兽龙的巨大食肉动物的下颚。

John and David decided to match the mechanical skeleton inside the head with what a real Giganotosaurus would look like based on expertise from paleontologists.

约翰和大卫决定根据古生物学家的专业知识，将头部内部的机械骨架与真正的江河巨兽龙的外观相匹配。