"Happiness" is not a countable noun. It would make no sense to have 18 happinesses.
"Felicidad" no es un sustantivo contable. No tendría sentido tener 18 felicidades.
"Apple" is a countable noun, so it makes grammatical sense to have five apples.
"Apple" es un sustantivo contable, por lo que tiene sentido gramatical tener cinco manzanas.
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