Barcelona terror attack
巴塞罗那恐袭带来的思考

As Spanish police investigate the origins of last week's terrorist attack on pedestrians in the Las Ramblas tourist district of Barcelona, Daniel Dombey asks Sam Jones and Michael Stothard what we know so far and how such attacks can be prevented.
过去的一周，又一座游人如织的欧洲名城遭到了恐怖袭击，近几年，这样的情形已经让人见惯不惊。这次恐袭给了我们怎样的教训？我们要怎样才能杜绝此类隐患？