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 174 55.2%
2 United States 91 28.9%
3 Germany 20 6.3%
4 Russia 7 2.2%
5 Netherlands 6 1.9%
6 Taiwan 5 1.6%
7 Japan 4 1.3%
8 Korea, Republic of 3 1%
9 Hong Kong 3 1%
10 Singapore 1 0.3%
11 Switzerland 1 0.3%