Translation of irreversibel

I counted the bills and saw that ten thousand Lire were still missing. The old man return to the children, grabbed the oldest one for a second time and hit him again. A minute later he came back with the missing.
Moreover, even if we know a lot about a certain culture, we will never be able to understand it in the same way and with the same depth as they do, since we have a very different point of view.
I boarded the AA flight to Cancun, and got there around two o'clock. It was my first time in Mexico. On the same night I had a flight booked to Havana, but I did not know whether I should take it.