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 169 50.4%
2 United States 93 27.8%
3 Germany 34 10.1%
4 Canada 24 7.2%
5 Russia 5 1.5%
6 Singapore 3 0.9%
7 Netherlands 2 0.6%
8 Austria 2 0.6%
9 Brazil 1 0.3%
10 Guatemala 1 0.3%
11 Kazakhstan 1 0.3%