Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

恐龙生存技能大赏恐龙生存技能大赏Dinosaur knowledge     甲龙类是恐龙家族中防御力最强的恐龙，但即便如此它们也有弱点，那就是柔软的腹部。古生物通过在蒙古发现的一具化石搞清楚了它们保护腹部的诀窍。Dinosaur ...