2021 | 总访问次数
排名 | 国家/地区 | 数量 | 占比 |
1 | China | 22 | 56.4% |
2 | United States | 11 | 28.2% |
3 | Germany | 4 | 10.3% |
4 | Iran, Islamic Republic of | 2 | 5.1% |
排名 | 国家/地区 | 数量 | 占比 |
1 | China | 22 | 56.4% |
2 | United States | 11 | 28.2% |
3 | Germany | 4 | 10.3% |
4 | Iran, Islamic Republic of | 2 | 5.1% |