我毕业于清华大学，我的专业是电脑。

I graduated from Qinghua University, my speciality is computer.

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两年前我毕业于清华大学，主修国际贸易。

Two years ago, I graduated from Tsinghua University. I majored in International Trade.

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我1999年毕业于清华大学。

I graduated from Tsinghua University in 1999.

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我1999年毕业于清华大学。

I graduated from Tsinghua University in 1999.

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