How to download detailed coordinate data of China's borders and display all the border coordinate points in full like in OSM map

General talk
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  1. Because the border is so long, the coordinate data contains over 250,000 points. As a result, when the point data downloaded from OSM is opened in mapping software, some points are automatically discarded when displayed. This results in a significant difference between the border line and the actual content viewed online in OSM. How can I download the coordinate data for every point and line in the OSM border data completely so that it can be opened and fully displayed in mapping software, such as QGIS?
  2. On the OSM website, after typing “China,” China’s national border line appears. In the lower left corner, there’s a “Download XML” button, but how do I use this XML data?
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QGIS should be capable of displaying such data

can you share how this “some points are automatically discarded when displayed. This results in a significant difference between the border line and the actual content viewed online in OSM” looks like?

how exactly you obtained this data? Maybe this process caused data loss, not QGIS itself

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1：由于边界太长，坐标数据点位数超过了250000个，导致在OSM下载下来的点位数据，在地图软件中打开后，显示时也会主动丢弃一些点位数据，导致边界线与实际在OSM中在线浏览的内容差别很大；如何才能将OSM中的边界数据每一个点、线的坐标数据完整下载下载，并且可以用地图软件打开并完整显示所以信息，例如使用QGIS
2：在OSM网站中，输入“中国”后，会出现中国的国界线，左下方，有“下载XML”，但是如何使用此XML数据