When the well reaches a pool, oil usually rises up the well because of its density difference with water beneath it or because of the pressure of expanding gas trapped above it.

当井和一个水池相接时，油通常会从井里上升，因为它与井下的水的密度不同，或者因为停留在它上方的膨胀气体的压力。

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He should be well positioned to explore my problem in the abstract and, unlike my friends, to avoid getting trapped in the inadequacies of my examples.

他应该会以抽象的方法探讨我提出的问题，而不会像我的朋友们那样陷入我举出的不恰当的例子里面去的。

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To make it travel more efficiently, researchers blasted a short burst of sound at an electron trapped in an energy well.

为了使之移动得更有效率，研究者对困在势阱中的电子加了一个短促的冲击声波。

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He planned to feed them fake or booby-trapped data via well-known radio communication systems.

BBC: Hacker targets flight deck computer systems

In considering the well-trapped and slick greens of Winged Foot, Casper took the opposite approach on the 215-yard par-three third hole.

WSJ: Billy Casper, Standing in the Shadow of Legends | Golf Journal

The speaker may well find himself trapped in a legislative impasse between conservative and pro-reform members, even though the reformers might have won a majority of the 270 seats in the parliament.

ECONOMIST: Iran