Number + 多年
多年 (duōnián) means "many years" or "multiple years." It is often combined with a number to indicate an approximate timespan, such as 100 多年 (over 100 years).
他在这家公司工作了多年。
Tā zài zhè jiā gōngsī gōngzuòle duōnián.
He has worked at this company for many years.
这座桥有一百多年的历史了。
Zhè zuò qiáo yǒu yībǎi duō nián de lìshǐ le.
This bridge has a history of over one hundred years.
多年以后,他终于回到了家乡。
Duōnián yǐhòu, tā zhōngyú huídàole jiāxiāng.
Many years later, he finally returned to his hometown.