Translation of transience in German

I know it is a little confusing. The problem is if the original word is a conjugated verb: I skipped them until now. I did not write it in my explanations. It actually must be skipped. Thanks for noticing.
It certainly is one of the reasons that a student from abroad is not as good in English as people who were born in America. This is an obstacle for all students and a challenge for the educational system.
I'd be very happy if you could correct my Spanish. In return, I'll help you too, of course. 3 years ago I traveled to Chile to visit the country, only for a month, unfortunately. Loved the Cordillera!