Translation of Drehzahl

One of the most difficult problems I have (and I am sure that others have it too) is getting used to the superficiality of the life in the US. To be superficial means to me not to be able to recognize.
In my next message to you I want to write everything in German. Than I will rewrite it in English and we can compare the output. This way you see the text in your mother tongue and in a foreign language.
The same evening we left Patagonia and flew to the capital of Argentina, Buenos Aires. We have waited a long time for this moment as we have not been in a city for almost two weeks and we usually love the city.