silver jubilee
noun [ C usually singular ] mainly UK uk/ˌsɪl.və ˈdʒuː.bɪ.liː/ us/ˌsɪl.vɚ ˈdʒuː.bɪ.liː/
25周年纪念日
a date that is exactly 25 years after the date of an important event
Compare: silver anniversary
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