Sea ice also increased the occurrence of oil spill of ice region. And ince oil spill prevention is much more difficult.

海冰灾害同样加大了发生冰区溢油事故的可能，而冰区溢油的防治比开阔海域溢油的防治更加困难。

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Since 1981, the occurrence of oil spills has been reduced by 60 percent, even though the volume of oil transport has doubled.

自从1981年以来，虽然石油运输总量增加了一倍，但是石油泄漏的发生减少了60%。

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In the course of offshore petroleum exploration and exploitation as well as oil transportation, effective measures must be taken to avoid occurrence of oil spill.

海洋石油勘探开发及输油过程中，必须采取有效措施，避免溢油事故的发生。

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It sought to see if the fish oil would prevent the next occurrence of symptoms.

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Depending on whether it was just a fluke occurrence or a sign that the constitution of the oil sands it processes is changing, the company could either retool its extraction process or, if the problem is a short-term one, blend the rich ore with more normal inputs.

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