该数据并不准确：过去的50年中有好几千次石油溢出事故 — — 通常这些事故都未被详细记录，其石油泄漏量常常被掩盖甚至被公司及政府故意忽略。
The data are uncertain: there have been many thousands of spills during this period – often poorly documented and their magnitude hidden or simply unmeasured by either the companies or the government.