diamond jubilee
noun [ C usually singular ] mainly UK uk/ˌdaɪə.mənd ˈdʒuː.bəl.iː/ us/ˌdaɪə.mənd ˈdʒuː.bə.liː/
60周年纪念日
the day exactly 60 years after an important occasion, or a special event to celebrate this
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