Why do I have so many simulators and how do I restore the basic platforms?

问题

Environment: Xcode v6.4

I just noticed that I have too may simulators.

Why has this happened and how do I control it?

来源：https://stackoverflow.com/questions/31438883/why-do-i-have-so-many-simulators-and-how-do-i-restore-the-basic-platforms