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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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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Owing to frequent occurrence of the major oil spill accidents, the international community has established a treaty system controlling pollution from ships and made perfect rules.

在重大溢油事故频发的背景下，国际社会已经逐步建立了一套控制船源污染的条约体系和较为完善的法律规则。

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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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