I graduated in 2004 from Huabei University, majoring in Chemistry and holding a b.

我2004年毕业于华北大学，主修化学，并持有学士学位。

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Jinxian depression is a major exploration area of Huabei Oil field in the recent years.

晋县凹陷近几年一直是华北油田勘探的主攻战场。

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Xu Huabei waved his hand violently, and it landed on the keyboard of the piano which sounded a horrible protest.

徐华北猛地挥起手，咚地砸在旁边的钢琴键盘上，那琴发出一声吓人的轰鸣。

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As a second-generation oilman, Zhang began working in 1990 for the First Machinery Factory of Huabei Petroleum Administration Bureau, a state oil subsidiary.

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