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 United States 153 41.5%
2 China 139 37.7%
3 Germany 28 7.6%
4 Canada 12 3.3%
5 Switzerland 7 1.9%
6 Spain 5 1.4%
7 Italy 5 1.4%
8 Singapore 4 1.1%
9 Hong Kong 3 0.8%
10 Iran, Islamic Republic of 3 0.8%
11 Finland 2 0.5%
12 France 2 0.5%
13 Mauritius 2 0.5%
14 South Africa 2 0.5%
15 United Arab Emirates 1 0.3%
16 Japan 1 0.3%