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.

同学们晚上好！今天给大家整理了雅思听力7分场景词汇。 平台声明：该文观点仅代表作者本人，搜狐号系信息发布平台，搜狐仅提供信息存储空间服务。

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