Question

anniversary

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an∙ni∙ver∙sa∙ry / ˌænəˈvɚsərɪ ; ˌænəˈvɜ:səri /
◙noun (plural anniversaries) [C]
1. a date on which something special or important happened in a previous year
• 周年纪念（日）:
 »Jack and Kim celebrated their twentiethwedding anniversaryin January.
  1 月，杰克和金庆祝了他们 20 周年结婚纪念日。
▪ [+of]
 »A huge parade was held on the anniversary of the 1959 revolution.
  1959 年革命纪念日那天举行了大规模游行活动。