it's a secret
Es un secreto que a todos nos encantaría tener.
It's a secret we'd all love to have.
— El hombre de la Tierra (2007)
I suppose it's a secret.
Señora, no es un secreto que siempre se ha negado a ser grabada.
Ma'am, it is no secret that you have always refused to be recorded.
— La diva (1981)