在此世紀之交時,全世界看到并體驗到了信息技術對人類社會帶來的沖擊(at the turn of )怎么樣翻譯才簡潔?順便再問一下,“在開幕式上,各個國家代表隊一個接一個地進入了運動場地”這里的“在開幕式上”用什么介詞?“各個國家代表隊”怎么翻譯好?

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at the turn of the century, the whold world has witnessed the impact brought about by information technology on human society.在開幕式上 at the opening ceremony各個國家代表隊teams of athletes from each nation