派生 conductor [kənˈdʌktə (r)] n.（交响乐、合唱的）指挥；（公交）售票员；列车员；导体 conductive [kənˈdʌktɪv] adj.（对电、热等）具有传导性的 ...

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.

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.

BEIJING, Jan. 20 (Xinhua) -- Chinese Premier Li Qiang on Monday presided over a symposium to hear opinions and suggestions on ...