The formula for calculating the back pressure to formations is derived.

推导了计算对地层回压的公式。

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Eventually we will have lowered the back pressure enough so that it is now equal to the pressure at the nozzle exit.

最终我们将有降低回压足以使现在是相等的压力，在喷嘴出口。

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Practice proved that adding chemicals not only decreases the viscosity of crude but also the back pressure of well head decreased.

实践证明，掺污水加药既可以降低原油粘度，又可以有效地降低井口回压。

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"That pressure's got to go somewhere. It might be going back up the well bore,"

VOA: standard.2010.01.02

If I place my container of gas on the table here, and I come back an hour later, the pressure needs to be the same when I come back Otherwise it's not equilibrium.

如果我把装气体的容器放在桌子上，一小时以后我再回来时,气体的压强应该是不变的,否则它就不是平衡的。

麻省理工公开课 - 热力学与动力学课程节选

It's reversible, that means that p external, equals p. I'm doing it very slowly so that I'm always in equilibrium between the external pressure and the internal pressure so I can go back and forth.

我都可以不损失能量，而把过程逆向进行,整个过程中的,每一步都保持平衡,现在我们来分别。

麻省理工公开课 - 热力学与动力学课程节选

The number four seed was becoming agitated, repeatedly gesticulating to his support team in the stands, but he retained sufficient composure to avert the danger and transfer the pressure back on to Ferrer's shoulders.

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Elsewhere in the Premier League, where the race for places in next season's Champions League won't be settled until the final day, Tottenham Hotspur put the pressure squarely back on Arsenal.

WSJ: A Winning Farewell For Alex Ferguson

Mr. Asher last week set out some eminently sensible recommendations to put the economic pressure back on.

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