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 76 38.6%
2 United States 65 33%
3 Germany 22 11.2%
4 Korea, Republic of 9 4.6%
5 Netherlands 7 3.6%
6 Russia 5 2.5%
7 Hong Kong 3 1.5%
8 France 2 1%
9 Senegal 2 1%
10 Lithuania 2 1%
11 Taiwan 2 1%
12 Sweden 1 0.5%
13 Kazakhstan 1 0.5%