大象是世界上最大的四条腿的动物。
The elephant is the biggest four legged animal in the world.
老师：汤姆，你能告诉我两个四条腿的动物吗？
Teacher: Tom, can you tell me two animals which have four legs?
这只恐龙很可能是原始的蜥脚类亚目动物——长颈、四条腿的食草动物，类似于我们较为熟悉的腕足类恐龙。
The animal would have been a primitive sauropod — a long-necked, four-legged grazer similar to the better known brachiosaurs.
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