It is pointed out that the effective migration passage, secondary migration force and oil-gas filling degree are the most important basic theories to be studied at present.

结果表明，油气有效运移通道、二次运移动力和油气充满度应是当前基础理论研究的重点。

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Imagine buying a car, driving it off the lot and never checking or changing the oil, filling it up with gas, or getting regular tune ups.

想象你买一辆小车，把它开走，可是从不检查油或换油，也不加油，更不进行常规调校。

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Eventually, the cost of filling Americans’ gas tanks could be influenced as much by hail in Iowa as by the bombing of an oil pipeline in Nigeria.

最终，俄亥俄的冰雹和尼日利亚一段油管的爆炸将对美国人油箱的加油花费产生同样的影响。

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