Silk had become one of the primary goods traded along the Silk Road by about 100 BC.
至公元前100年左右，丝绸已经成为丝绸之路上的主要贸易商品之一。
2
Who works across the spectrum in countries, from primary prevention work through to rehabilitation of those who have been involved in road traffic crashes.
世卫组织在国家的工作涵盖一系列方面，从一级预防方面的工作到道路交通事故所涉人员的康复。
3
Parents know that the road to the best universities begins with the best primary schools, and getting your child into one of those takes connections or money.