Read the verses again. They did understand them.
Acts 2
7 And they were all amazed and marvelled, saying one to another, Behold, are not all these which speak Galilaeans?
8 And how hear we every man in our own tongue, wherein we were born?
11 Cretes and Arabians, we do hear them speak in our tongues the wonderful works of God.
Given the definition of the Greek word, the context, etc, one is forced to say that this is merely the Holy Spirit allowing the disciples to speak languages they have had no study in nor knew. They were Galilaeans.
γλῶσσα glōssa, gloce-sah'; of uncertain affinity; the tongue; by implication, a language (specially, one naturally unacquired):—tongue.
- the tongue, a member of the body, an organ of speech
- a tongue
- the language or dialect used by a particular people distinct from that of other nations
Because they were mocking them.
13 Others mocking said, These men are full of new wine.
People mock Christians all the time even today. When I was a worldly person, I've hung around the alcoholic scene plenty to know that they do not speak the gibberish people want to say "tongues" is today. They slur sure. Broken sentence structure, sure. But they were still able to speak their native language. Not the gibberish that goes on with people who want to believe miracles still happen now.
Since they were mocking them, it would be no surprise that they would state Peter and the others to be drunk off sweet wine grape juice.
120? Where did that number come in?
What is even more interesting, is that you believe in miracles, yet you somehow dont believe that these people could hear their own language. Also, it wasnt just Jews, verses 9-11 state many other different nations of people too.
Though, I personally do not find it that hard to differentiate my own language in crowded, diverse environments. Born in a heavy tourist happy location, we would get into events that were crowded full of people of different languages, all talking, and I can find out who is speaking English. Of course if they are close enough for my hearing in a crowed place. However, that is not a miraculous event either.
Because that was a miraculous event, it shouldn't be too hard to believe.
If you knew, why would we be discussing contrary to each other? Using scripture and the Greek wording, I have proven so. I am not using my opinions.
And so, I kindly refer you back to my very first posting. That is the evidence in scripture proving miracles are no longer.