Translation of aufstreben

He also told me that he had build his scooter by himself. I could not understand how a doctor was able to build such a machine on his own. It seems that the circumstances made people capable of many things.
For example, there are many regions in the United States in which only few African-Americans live. Somehow intolerance is the biggest there, because the citizens there are not used to foreigners.
For quite a while we were considering to offer a downloadable version of Vocabulix. I could put a popup screen where it says: 'wanna download a Vocabulary Builder or continue with our online lessons?'.