This includes expertise vital to keeping the oil pumps working: with the skilled engineers formerly on the PDVSA payroll now plying their trade elsewhere, the system limps on with a skeleton staff.
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，详情可参考同城约会
Фото: Paolo Picciotto/REDA/Universal Images Group via Getty Images)
// 步骤3：遍历排序后的位置，用单调栈判断独立车队