root [ruːt] ① n. 根;(问题的)根源,起因;起源,基础 ② v.(使)生根;扎根 例句 The sports team you’ve rooted for your whole life loses a championship game or series.【2018-8《美国新闻与世界报道》】 ...
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.