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 161 54.6%
2 United States 73 24.7%
3 Germany 33 11.2%
4 Canada 12 4.1%
5 Hong Kong 5 1.7%
6 Russia 4 1.4%
7 France 2 0.7%
8 Iran, Islamic Republic of 2 0.7%
9 Netherlands 2 0.7%
10 Singapore 1 0.3%