美国有线电视新闻网 （CNN） 称这是中国手中握有的一张有力王牌 （a powerful card to play） ，是中国对美国拥有绝对优势的一个领域。 Unlike tariffs, it’s a front where Trump has ...

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.