多年以来

• for many years (in the past)
• for years

例句

1. 多年以来保守党第一次处於反对党的地位。
   The Conservative party was in opposition for the first time in years.
2. 许多年以来，研究人员就开始探索人们思考问题的方式，期望创建一种能够像人一样思考的计算机。
   For many years, researchers have been exploring the way people think in hopes of creating a computer that thinks like a person.
3. 大部分摇滚乐团都很快就不受人欢迎了，但是甲壳虫乐队却多年以来一直博得人们的青睐。
   Most rock groups lose popularity very quickly, but the Beatles stayed on the beam for many years.