Spiegel always comes up "simulate". Doesn't it really mean "mirror"?
Is that here on Duolingo? If so, you should report it.
Der Spiegel = the mirror or any kind of reflecting surface. Also: the level of a fluid (der Wasserspiegel des Sees)
There is a verb spiegeln = (to) reflect
(to) simulate = simulieren, nachmachen, imitieren, vortäuschen