维京具有哪些升级选项?它究竟属于地面单元还是空中单元?或者是步兵单元?

维京具有哪些升级选项?它究竟属于地面单元还是空中单元?或者是步兵单元?的英文翻译

基本释义

• What upgrade type (assuming these are returning) is the Viking using? Vehicle or ship? (Or perhaps infantry?