在此世纪之交时，全世界看到并体验到了信息技术对人类社会带来的冲击（at the turn of ）怎么样翻译才简洁？顺便再问一下，“在开幕式上，各个国家代表队一个接一个地进入了运动场地”这里的“在开幕式上”用什么介词？“各个国家代表队”怎么翻译好？
热心网友
at the turn of the century, the whold world has witnessed the impact brought about by information technology on human society.在开幕式上 at the opening ceremony各个国家代表队teams of athletes from each nation