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"Las naranjas" is a form of "naranja", a noun which is often translated as "orange". "Las manzanas" is a form of "manzana", a noun which is often translated as "apple". Learn more about the difference between "las naranjas" and "las manzanas" below.
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).