Birds including lapwings are expected to benefit from their new "island" habitat
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」
，推荐阅读搜狗输入法2026获取更多信息
"I was pulling pipes off the houses to stop myself being dragged out - the wave was powerful enough to break doors and windows."，更多细节参见51吃瓜
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