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

新华财经纽约5月20日电（刘亚南 谢哲澍）由于市场对贸易紧张局势缓和与通胀放缓的乐观情绪遭到质疑，20日美国纽约股市三大股指低开，早盘窄幅盘整，午后跌幅扩大， 尾盘跌幅显著收窄。