R语言画出疫情地图，中国累计的疫情数据，热力地图(Use R language to draw epidemic map, cumulative epidemic data of China, thermal map)

通过时事数据可视化系统，可以清楚地了解全球疫情分布的状况以及密度，以便做出相应的对策(Through the current affairs data visualization system, it is possible to clearly understand the distribution and density of the global epidemic in order to make corresponding countermeasures)