This article will be written in a technical research mode, and non-technical students can skip it.
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background
In the iteration of the historical architecture, the entry-level module of the service has sprung up after the spring rain and is in the ascendant, so that it is now in full swing, and finally becomes one of the basic services in the service positioning.
Its core functions are generally public and general functions such as cleaning, funneling, coloring, tracking, etc. of traffic.