Iam happy to join with you today in what will go down in history as the greatest demonstration for freedom in the history of our nation. 　　今天我很高兴能同大家一起参加这次将成为我国历史上为争取自由而举行的最伟大的 示威集会。 　　Five score years ago, a great American, in whose symbolic shadow we stand today, signed the E...