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superficie para una excelente unión sin fisuras ni resquebrajaduras en la cerámica.
and even surface conditioning for perfect bonding character- istics without stress or cracks in porcelain.
algunas especies buscan comida en la superficie, otras en las capas medias del agua y otras cerca del fondo.
some species search for food at the surface, others in the middle water layers, and yet other ones near the bottom.