In the weather forecast after CCTV news broadcast, a square is drawn with a straight line in the lower left corner of the screen. What happened?

This is the consistent practice of the official publication of maps and related works in China. If you don't believe me, go back and read all the geography books from elementary school to high school and the national maps available in the market.

The lower left part is an enlarged view of the South China Sea. According to the scale of the basic map, if you want to display the whole China region alone, you can't display the South China Sea at the same time-unless it includes a large part of Southeast Asia, which is generally not allowed internationally, because the map should be marked with "Map of People's Republic of China (PRC)", but it shows the whole picture of other countries (note that it is "the whole picture"), and no matter how you interpret it, it is suspected of infringing on sovereignty. The neighboring countries in the north and west of China are relatively large, so this will not happen. Southeast Asia is different, with too many small countries and too close to the South China Sea. Therefore, the best way is to attach a partial enlargement below the ordinary logo map. If anyone can buy a map of their country published by the United States, they should also be able to see the special local signs of Alaska and Hawaii.

We should safeguard the sovereignty of our own country, at the same time, we can't infringe the sovereignty of other countries in any form that is not allowed. This is the starting point and fundamental point of special recognition of local maps.