Can refer to a shell of a mollusk or a valve in anatomy.
La valva de la ostra es hermosa y brilla bajo la luz del sol.
The shell of the oyster is beautiful and shines under the sunlight.
La valva de la ostra es una maravilla de la naturaleza, con su forma y textura únicas.
The shell of the oyster is a wonder of nature, with its unique shape and texture.