2018 | 总访问次数
排名 | 国家/地区 | 数量 | 占比 |
1 | United States | 9 | 52.9% |
2 | China | 3 | 17.6% |
3 | Germany | 3 | 17.6% |
4 | Republic of Korea | 2 | 11.8% |
排名 | 国家/地区 | 数量 | 占比 |
1 | United States | 9 | 52.9% |
2 | China | 3 | 17.6% |
3 | Germany | 3 | 17.6% |
4 | Republic of Korea | 2 | 11.8% |