Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
欢迎您到美语咖啡屋!J: Hello, I'm Jody. Welcome to American Cafe! So, Yang Chen, I was looking at our web site for American Cafe and we have a problem.Y: 我们的网页有问题?