三年 (+ 的 + Noun)
三年 (sān nián) means "three years" and functions as a time duration phrase. It combines the numeral 三 (three) with the time unit 年 (year). This compound is commonly used in time-frame expressions like 未来三年 (the next three years) or 过去三年 (the past three years).
我在这家公司已经工作三年了。
Wǒ zài zhè jiā gōngsī yǐjīng gōngzuò sān nián le.
I have already been working at this company for three years.
未来三年我们计划扩大海外市场。
Wèilái sān nián wǒmen jìhuà kuòdà hǎiwài shìchǎng.
In the next three years, we plan to expand into overseas markets.
过去三年他一直住在上海。
Guòqù sān nián tā yìzhí zhù zài Shànghǎi.
He has been living in Shanghai for the past three years.