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。
Many owners sitting on 3% to 4% mortgage rates still hesitate to trade up, but the gap between their existing rate and today’s has narrowed enough that life events like family changes and relocations are starting to push more listings onto the market, according to Realtor.
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2015年1月，在中央党校县委书记研修班学员座谈会上，习近平总书记讲述了山西右玉县治沙造林的故事。