predicar en el desierto

Examples:

ES: Venga, marchaos todos a casa, es predicar en el desierto.
EN: Then everyone can go home.
ES: - Está cansado de predicar en el desierto.
EN: -He's tired of preaching in the desert.
ES: Sé que ya lo he dicho antes, y perdonadme si me pongo a predicar en el desierto, pero no podemos tolerar el juego duro.
EN: Bu i know I've said his before, and please forgive me if I'm flogging a dead horse, bu we canno allow rough play.
ES: Que es como predicar en el desierto.
EN: You're preaching to the converted.
ES: Después de predicar en el desierto, el diputado Wang preside hoy la Comisión de Defensa Nacional.
EN: After preaching in the desert, deputy Wang now presides over the National Defence Committee.

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