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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At this point, Amazon has a few different 4K models of streaming stick to choose from, so what makes the Fire TV Stick 4K Select different? Well, it allows you to stream in 4K Ultra HD with High Dynamic Range 10+, but it doesn't support Dolby Vision like its more expensive counterparts. It also supports WiFi 5 — whereas pricier models support WiFi 6 or WiFi 6E — for improved streaming quality. If you don't mind these aspects, this is a great way to score higher picture quality for less.