Translation of trinchera

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.
The place I have been to is famous for its many language schools. People come from all over the world to learn Spanish and practise their language skills. I guess there are more than two hundred schools there.
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