// 第一步：倒序遍历nums2，用单调栈计算每个元素的下一个更大值
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对于普通创业者，银发经济的切入点在于“细分场景的深度服务”。例如，永安市推出的“共享奶奶”等改革创新品牌，展示了如何通过社区互助模式挖掘银发群体的劳动力余热及服务需求 [40]。此外，结合“以旧换新”政策，针对老年人家庭的智能家电更新换代和适老化家具配置，亦是极具潜力的低门槛创业方向 [5, 13]。
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Petrochemicals – of which plastics are the dominant output – now account for roughly 75% of net global oil-demand growth, and are projected to become the largest driver of future oil demand. Plastic production has already doubled in the past two decades. Major oil companies are responding accordingly. Recent consolidation – including a $60bn merger creating one of the world’s largest plastics producers – reflects a deliberate pivot toward petrochemical assets as a long-term demand anchor.