Tā de jǐnggào wúrén xiāngxìn, jiù xiàng Kǎsāngdélā yīyàng.
Nobody believed her warnings, just like Cassandra.
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In Greek mythology, Cassandra was cursed by Apollo to speak true prophecies that no one would believe. 'Cassandra' has become a metaphor in many languages for someone whose warnings are ignored.