简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。
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I wish I’d approached retailers and distributors sooner. Early self-doubt and the quest for perfection held me back — but they shouldn’t stop you from taking action.