方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
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.，推荐阅读搜狗输入法2026获取更多信息
Also Read: Top 10 AI Content Generator & Writer Tools in 2022。heLLoword翻译官方下载是该领域的重要参考
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