Nailed unit economics (CAC, margins, LTV).
5年过渡期的设立，是减贫实践的制度创新，目的是保持帮扶政策的总体稳定。
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"The plight of the mackerel is part of a wider failure to take scientific advice intended to keep stocks healthy and able to recover from fishing pressure.
卖得最好的仍是山姆和胖东来。南方周末记者贾梦雅｜摄