卖掉建筑，如果你要使用地面控制或者支援技能的话，也可以保留一段时间。
Sell the building or keep it for a while if you wish to use Ground control or support powers.
你拥有轨道炮升级并且支援技能预备就绪了，那么什么时候你应该使用它呢？
So you have the Railgun upgrade and the support power all ready but when should you use it?
把最初从支援游戏技能力召唤的两队影队飞到敌人的扩张点去摧毁它。
Send the first two Shadow Teams from the support power and fly them into the enemy's expansion and destroy it.
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