The comments made by Chakib Khelil, Algeria's energy minister, came as oil prices hit a historic peak close to $120 a barrel, putting further pressure on global economies.

阿尔及利亚能源部长克利勒的此番评论，正值油价触及每桶120美元的历史高点之际，给全球经济带来了进一步的压力。

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It is the key study how to make sure the pressure distribution of liquid in the pump barrel and to study the pump valve-ball's movement to improve the systematic efficiency.

对有杆抽油泵泵阀运动规律的研究和确定抽油泵泵阀筒内液体压力的分布是提高抽油机井系统效率研究的关键性课题。

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Welding joints must be certified before implementation of the welding process, thereby, the improvement of the welding process on barrel of pressure vessel is proved.

实施筒体的焊接工艺前，必须验证焊接接头的使用性能，从而证明压力容器筒体焊接工艺的重要性。

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They decline significantly from one year to the next because each barrel of oil taken from a reservoir reduces the pressure within the field, leaving less force available to push the next barrel of oil up the well.

FORBES: $40 Oil In The Next 12 Months? Sorry Porter Stansberry, But I Don't Think So

Another reason to like Cracker Barrel is the presence of an activist investor helping to keep pressure on the company to improve performance: Sardar Biglari, the 35-year old Iranian-American manager of the Lion Fund and CEO of publicly traded Biglari Holdings (BH).

FORBES: Relax In Your Rocker, Snack On Cracker Barrel's Tasty Dividend

Members of Opec, made up of the world's major oil producers, have come under pressure to do something to stop the recent sharp rises in the cost of a barrel.

BBC: Opec agrees output boost