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 33 36.3%
2 United States 26 28.6%
3 Netherlands 11 12.1%
4 Germany 8 8.8%
5 Korea, Republic of 5 5.5%
6 Taiwan 3 3.3%
7 Russia 2 2.2%
8 Canada 1 1.1%
9 Macao 1 1.1%
10 Hong Kong 1 1.1%