翻译50 years of analyses based on such efforts

全句是50 years of analyses based on such efforts have usually added little beyond error to the prediction equation.请问如何翻译。文章讲的是测量工具的局限性

翻译50 years of analyses based on such efforts 谁能给我翻译一下？we are together again after a separation of three years “A couple of years”到底是指几年？ 84% pecent of glaciers have drawn back over the past 50 years in response to a warmer climate. 1.there is a temple with a history of 400years.有a对么? 1700年历史的翻译为什么是the tradition of 1700 years?用the history of 1700years可以吗？ He is the only one of the students who ( ) a winner of scholarship for three years. Just in front of our house __ with a history of 1,000 years. "A Retrospective of 25 Years of Hits"里第一首歌是什么名字 in the favor of the crowd with amusements undreamed of a hundred years ago什么意思