二足动物开始直立行走。
此外，专家还说，我们祖先在进化到二足动物时期的时候，凭借着“后肢动物”的优势更容易打败“前肢动物”，因为从上至下出拳力量会更大。
Standing up on their hind legs allowed our ancestors to fight with the strength of their forelimbs, making punching much more dangerous.
(古生)板足鲎目的：一种巨大的、有节的，属于板足鲎目的水生节肢动物，生存于奥陶纪到二叠纪时期。
Eurypterid: any of various large segmented aquatic arthropods of the order eurypterida that existed from the ordovician period to the Permian period.
作为两足动物，我们直立的习惯在动物界是独一无二的，这种习惯也是为了适应我们的身体和大脑而采取的一种特殊补偿。
Known as bipedalism, our habitual upright posture is unique in the animal kingdom and has arisen through specific complementary adaptations of the body and brain.
八只触角的头足类动物预言家死于自然原因，他生活过的水族馆在星期二说。
The eight-tentacled cephalopod oracle died of natural causes, the aquarium where he lived said Tuesday.
八只触角的头足类动物预言家死于自然原因，他生活过的水族馆在星期二说。
The eight-tentacled cephalopod oracle died of natural causes, the aquarium where he lived said Tuesday.
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