I assume the orbital command is now a replacement of the surveillance center?
我认为轨道指挥部是替代监测中心的，对吗？
The PF prerequisite building is the Engineering Bay and the Orbital Command prerequisite building is the Barracks.
行星堡垒的前提建筑是工程湾，轨道指挥部的前提建筑是兵营。
On a side note cause I'm sure somebody is wondering this as well - the PF upgrade costs 150 minerals and 150 gas whereas the Orbital Command upgrade costs just 150 minerals.
作为边注，我想有人肯定也会对这个有疑问-行星堡垒消耗150矿和150气而轨道指挥部只需要150矿。
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