street smarts
noun/ˈstriːt smɑːts/
/ˈstriːt smɑːrts/
[plural] (North American English, informal)- the knowledge and experience that is needed to deal with the difficulties and dangers of life in a big city
都市生活诀窍，都市人的精明，街头智慧（应对大都市生活的困难和危险所需的知识和经验）