When translated to English, the phrase "carros usados" found on Craigslist means "used cars." "Carros usados" is a Spanish phrase that can be translated to any other language.
The Spanish word "carros" can translate to either "car" or "shopping cart" in English but "car" is the word that works best for this specific phrase on Craigslist. It is also considered a proper translation to English from Spanish by saying "secondhand cars." Either phrase is considered proper in both the English and the Spanish languages. If one wanted to add the phrase "for sale" at the end of the sentence, "a la venta" would be added to the end of the Spanish phrase.