China also is upgrading its air defense systems.
中国同时也在升级其防空系统。
Why China couldn't make their own air defense systems?
为什么中国不能制造他们自己的空中防御系统？
As seen above, several air defense systems popped up on the map.
如上所述，一些防空系统出现在地图上。
As seen above, several air defense systems popped up on the map.
如上所述，一些防空系统出现在地图上。
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