BPG致力于知识的发现和传播
Total Visits of This Article
2021 | 总访问次数
排名 国家/地区 数量 占比
1 China 189 50.3%
2 United States 104 27.7%
3 Germany 62 16.5%
4 Canada 10 2.7%
5 Russia 5 1.3%
6 Lao People's Democratic Republic 3 0.8%
7 Hong Kong 2 0.5%
8 Switzerland 1 0.3%