大米是世界上半数以上人口的主食。
Roughly one-half of the world's population, including virtually all of East and Southeast Asia also, is wholly dependent on rice to be its staple food.世界上大约一半的人口，包括几乎所有的东亚和东南亚国家，都完全以大米作为主食。
Barley was an unexpected find: the crop was domesticated in Western Eurasia and didn't become a staple food in central China until about 2,000 years ago, according to the researchers.研究人员说，大麦是一个意外发现：这种作物生长在欧亚大陆西部，直到大约两千年前才成为中国中部地区的主食。
