Change of ground stress influences pore pressure and oil potential, thus has a great influence upon oil migration accumulation.

地应力变化影响孔隙压力和油势，因而对石油运移和聚集有重要影响。

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When oil enters the hole of water-wet sandstone driven by pressure difference, oil migrates following a line of less resistance because of the migration force of oil is bigger than that of water.

油在压差驱动下注入亲水砂岩孔隙的过程中，油的运移阻力比水大，因而，油往往沿阻力较低的有限通道运移。

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Climate change is a threat multiplier - it can exacerbate the migration and displacement of populations and contribute to crop failure or flooding, increasing pressure at home and on livelihoods.

气候变化滋生着各种威胁，它可能加剧人口的迁移和流离失所，并导致作物歉收或洪水泛滥，从而给家庭增加生计压力。

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Pressure group Migration Watch UK welcomed the overall drop in net migration.

BBC: UK Border Agency

Conservative ministers, who are committed to substantially reducing levels of net migration, are under pressure from backbenchers to say how the UK will deal with a potential influx of new arrivals.

BBC: Airport arrivals sign

And as Western countries continue to struggle with sky-high unemployment, there is significant political pressure building against the idea of further labor migration.

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