China also is upgrading its air defense systems.

中国同时也在升级其防空系统。

youdao

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。

youdao

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。

youdao