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.

美国白宫最新声明表示，由于中国采取报复性措施，美对华关税加增至245%。这是否会影响广交会境外采购商的信心？广东外语外贸大学的巴西留学生孙华（Raphael）应羊城晚报“iSeeChina”（中国探秘官）栏目之邀，走进广交会展馆，寻找问题的答案。