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"La espalda" is a form of "espalda", a noun which is often translated as "back". "El pecho" is a form of "pecho", a noun which is often translated as "chest". Learn more about the difference between "la espalda" and "el pecho" below.
la espalda()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
1. (anatomy)
2. (sports)
a. backstroke
Mi vecino es campeón de espalda y de estilo libre.My neighbor is a backstroke and freestyle champion.
el pecho()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
