He has held the post for three years.

他担任这个职务已经三年了。

《牛津词典》

She studied chemistry for three years.

她学了三年化学。

《牛津词典》

He was held in captivity for three years.

他被监禁了三年。

《牛津词典》

For three years, al-Shabab has led militants in battles -- mostly against the peacekeepers -- for control of Mogadishu.

VOA: special.2010.07.17

Before becoming President Bush's White House Chief of Staff, he was President Bush's Director of the Office of Management and Bugdet for three years.

在成为小布什的,白宫办公厅主任之前，他是,小布什的管理与预算办公室主任,在那里工作了三年。

普林斯顿公开课 - 国际座谈会课程节选

I lived on campus for three years, but right now I live off campus.

我在校内住了三年，但现在我住在校外。

住宿环境怎样？ - SpeakingMax英语口语达人

For three years, he clandestinely saw a therapist, paying in cash so there would be no record.

NEWSWEEK: Culture

Emerging markets have outperformed for three years, but we believe this is a long-term phenomenon.

FORBES: Go Global For Diversification And Gains

Similarly, revenue has increased for three years, but is lower than it was in 2005.

FORBES: Eight of Buffett's Ten Biggest Holdings Up for 2011