const format = (v) = JSON.stringify(v, null, 2);
与“买一个品牌”不同，这种方式更像是在现有能力边界上做延伸，风险更可控，但回报节奏也相对较慢。
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// 1. 建堆：从最后一个非叶子节点开始向上调整
They currently make 240 food boxes each week, double the amount produced three years ago, handing them out as they make their way through the city's streets.