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safety curtain

noun
🔊/ˈseɪfti kɜːtn/
🔊/ˈseɪfti kɜːrtn/
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  1. a curtain which can come down across the stage in a theatre, intended to stop a fire from spreading（剧场舞台的）防火帘，隔火帐，防火幕Topics Film and theatrec2