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// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
。夫子是该领域的重要参考
延迟 — 用户需要等待响应，速度取决于网络连接质量
"You're keeping it out of your general waste bin, keeping it out of landfill, reducing those emissions that will come from that food rotting in landfill, but you're also keeping your waste clean to allow that to be recycled," she said.