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（书、电影、人生等的）中心思想，主题，主旨
A leitmotif in something such as a book or film or in a person's life is an idea or an object which occurs again and again.
例句
The title of one of Dietrich's best-known songs could serve as the leitmotif for her life.
黛德丽的一生可用她的一首名曲的名字来概括。