During the Chávez presidency, Venezuela reclassified its reserves. Previously, there were thought to be just 80 billion barrels of extractable oil, but by 2011, its reported figure had nearly quadrupled. That statistical change was made possible by high oil prices at the time, which allowed previously unviable projects to look feasible.
checks one at a time in front of the operator, who read information like the
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// 'view' should now be detached and unusable
// 易错点2：用Math.ceil/Math.floor取整 → 破坏时间比较逻辑，必须精确计算