For example, an elephant's four tree trunk-like legs keep its center of mass over its feet, while T. rex would have had to balance its mass differently over its two small legs, bending them to keep from toppling over.
For example, an elephant's four tree trunk-like legs keep its center of mass over its feet, while T. rex would have had to balance its mass differently over its two small legs, bending them to keep from toppling over.
比如，大象的树干般的四条腿能让它的质心保持在腿上，而暴龙必须通过将让它们弯曲以避免摔倒，而用不同地方式在两条腿上保持平衡。