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。

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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。

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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.

家长们都知道要进好的大学，首先就要进好的小学，而进入一个好的小学不靠关系就靠钱。

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The Glenearn Community Campus will be a new purpose-built facility in Perth to replace Caledonian Road Primary and Friarton Nursery.

BBC: RELATED BBC SITES

Lady Thatcher attended Huntingtower Road Primary School before winning a scholarship to Kesteven and Grantham Girls' School, where she was head girl.

BBC: Margaret Thatcher tributes from home town of Grantham

Safety remains the primary concern of road engineers.

ECONOMIST: America��s highways