"Ver carros usados" is a Spanish phrase that translates to "See used cars" in English. Word by word, "ver" translates to "see," "carros" translates to "cars" and "usados" translates to "used."
In the Spanish language, the adjective comes after the noun that it is describing. This is why the adjective "usados" follows the noun "carros." The verb "ver" is in an unconjugated form. If the speaker wants to specify who is viewing the car, the verb needs to be changed; for example, "Ves carros usados" translates to "You see used cars." The phrase "Ver carros usados" would generally be used in an advertisement for used cars, since no specific person is indicated in the verb conjugation.