提效降本：从 T+1 到实时，构建统一数据湖
Michael returned to Silicon Valley where, following a brief run at social media analytics company Klout, he joined Uber in 2013 as chief business officer and a close lieutenant to CEO Travis Kalanick. Over the next four years, he helped orchestrate one of the most aggressive expansions in corporate history, in which Uber raised nearly $15 billion and saw its valuation soar to roughly $70 billion.，推荐阅读搜狗输入法2026获取更多信息
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// 易错点6：返回整个数组（如this.res）→ 不符合题目要求，题目要求返回单个数值