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」
26日夜间至27日凌晨，阿富汗和巴基斯坦在两国边境地区发生交火，巴军空袭阿首都喀布尔以及南部坎大哈省、东部帕克提卡省多个地点，两国紧张局势快速升级。巴国防部长阿西夫27日宣布对阿展开“公开战争”。（央视新闻）
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Environment variables (PIXELS_TRUENAS_HOST, PIXELS_TRUENAS_API_KEY, etc.)
Beyond update dates, freshness signals include referencing recent events, citing current statistics and data, mentioning the current year in context where relevant, and updating examples to reflect current tools and practices. These signals reassure both AI models and human readers that the information hasn't become outdated even if the core topic is relatively stable.