在当今世界上的公路交通中,存在着两种完全相反(contrary)的规则(regulation)。一是绝大多数国家遵行的车马、行人靠右行的规则;一是少数几个国家实行的靠左行的规则。而在很长一段时间内,“左行”曾在地球上居于统治地位(a dom inantposition)。古时候我们的祖先(ancestors)出 In highway traffic in today’s world, there are two types of contrary regulation. First, the vast majority of countries to comply with the horses, pedestrians on the right line rule; First, a few countries by the left-hand rule. For a long time, however, the “left bank” had dominated the earth. In ancient times our ancestors came out