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 212 30%
2 China 187 26.4%
3 Finland 151 21.4%
4 Germany 83 11.7%
5 Canada 62 8.8%
6 France 3 0.4%
7 Hong Kong 3 0.4%
8 Iran, Islamic Republic of 3 0.4%
9 Norway 2 0.3%
10 Netherlands 1 0.1%