Road signs and official public documents are written in both Welsh and English, and schoolchildren are required to learn both languages.
路牌和官方的公开文件都同时使用威尔士语和英语，学校的学生也都被要求学习这两种语言。
By contrast, Referral Web primarily builds its model of its users' social network by data mining public documents found on the Web.
相反，提名网主要通过挖掘互联网上的公共文档来构建用户的社会网络模型。
By contrast, Referral Web primarily builds its model of its users' social network by data mining public documents found on the Web.
相反，提名网主要通过挖掘互联网上的公共文档来构建用户的社会网络模型。
应用推荐