silver anniversary
noun/ˌsɪlvər ænɪˈvɜːsəri/
/ˌsɪlvər ænɪˈvɜːrsəri/
(especially US English)- (also silver wedding anniversary British English, North American English)(British English silver wedding)the 25th anniversary of a wedding
银婚（结婚 25 周年纪念） - (British English silver jubilee)the 25th anniversary of an important event; a celebration of something that began 25 years ago
25 周年；25 周年纪念