动物衰老的速度曾经被认为是与其体型大小相关的。
The rate at which an animal aged was once believed to be related to its size.
之前的想法一直是，在霸王龙形成庞大体型的进化过程中，它们需要调整全身骨骼的大小，以便能够适应食肉动物的行动。
The thinking has been that as tyrannosaurs developed to a truly giant size, they needed to modify their entire skeleton so they could function as predators.
这种动物体型只有霸王龙的九十分之一或百分之一大小，但却具有霸王龙其他所有的重要特征，硕大的头部、强健的肌肉还有短小的前肢。
Here we have an animal that's one 90th or one 100th the size of T. Rex, but with all the signature features, the big head, the strong muscles and the tiny little arms.
婆罗洲云豹的大小与小型美洲狮相当，其犬齿长度相对于体型来说居猫科动物之首。
The size of a panther it has the longest canine teeth relative to body size of any cat.
现在，研究人员们发现了同样有一身皮毛的这些动物在体型大小方面差别如此之大的原因。
Now, researchers have uncovered a reason why the animals wearing that skin vary so much in size.
现在，研究人员们发现了同样有一身皮毛的这些动物在体型大小方面差别如此之大的原因。
Now, researchers have uncovered a reason why the animals wearing that skin vary so much in size.
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