NFC North Cities - CHICAGO, DETROIT, GREEN BAY, MINNEAPOLIS
用电量，为观察中国经济提供了一扇窗口。
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pip’s --uploaded-prior-to and npm’s older --before flag both take absolute timestamps, and the discussion about adding relative duration support to pip reveals how these two modes serve different goals that happen to share implementation surface. An absolute timestamp pins your dependency resolution to a moment in time, so running the same install six months from now produces the same result, which is a reproducibility feature. A relative duration like 7 days creates a sliding window that moves forward with you, so you always exclude recently published packages regardless of when you run the build, which is a security feature. uv’s --exclude-newer accepts both forms, and npm has both --before for absolute dates and min-release-age for relative durations. pnpm, Yarn, Bun, and Deno only accept relative durations.
宋健：在以前的SaaS行业，从一块钱的收入到1亿的收入到10亿的收入，其实就看销售的人数是不是从1到10到百到千到万。产品的迭代速度完全是工程师的数量乘以工程师的质量。