The phrase "urban centers" refers to the main or important areas within cities or towns where people live, work, or gather for activities like shopping, entertainment, and socializing. Full definition
I've talked to vertical farmers in urban centers who want to grow indoors with LED lighting. (scientificamerican.com)
It is very fair to say that the majority of people buying electronic readers and ebooks live in major urban centers. (goodereader.com)
What I'm thinking is that there could be a great opportunity for indies, especially in large urban centers with a vibrant library system. (thecreativepenn.com)