Conference USA, Mountain West and FBS Independence are all what?

Conference USA，Mountain West以及FBS Independence都代表什么？

I saw just under two hours of control at 60 FBS and low settings but I got more than four hours in less intensive games with the frame limiters set to 30 FPSs.

我在 60 FBS 和低设置下看到了不到两个小时的控制，但在帧限制器设置为 30 FPS 的不太密集的游戏中我得到了四个多小时。