During the long, ob scure, dimly defined prehistoric period when man lived as a wandering hunter and food gatherer, frequent food shortages must have prevented the development of village civilizations.

• 在漫长、不明确、界限模糊的史前时期，人们处于游猎和食物收集时期，经常性的食品短缺肯定阻碍了村庄文明的发展。