结构推理 My fellow leaders,
Let me begin by saying it is a great honor to have this unprecedented gathering of world leaders in the United States.We come together not at a remarkable moment on the calendar,but at a dawn of a new era in human affairs,when globalization,revolution and information technology have brought us together than ever before.
To an extent unimaginable just a few years ago,we reach across geographical and cultural divides.We know what is going on in each other's countries.We share experiences,triumphs,tragedies,aspirations.

【正确答案】诸位领导人：
首先，我对此史无前例的世界各国领导人大会能在美国举行深感荣幸。我们不是相聚在一个日历上非常特别的时刻，而是相聚在人类历史上一个新时代的黎明时分。今天，全球化、技术革命和信息技术使我们之间比以往任何时刻都更加亲近。
我们跨越了地理上和文化上的界限，其深入程度在几年前简直无法想象。我们彼此都知道对方国家正在发生的事情。我们分享经验、成功、灾难和渴望。

【答案解析】本文是一段领导人的演讲词。定语从句when globalization，revolution andinformation technology have brought us together than ever before的翻译单独成句，并且加入了“今天”这个时间副词，非常符合当时的场合。在对To an extentunimaginable just a few years ago，we reach across geographical and culturaldivides的翻译中，为强调句子的核心内容，即句子的状语部分，译文把状语部分放在最后，符合汉语的行文习惯。