名词
中文翻译：半世纪纪念
同义词：
['quinquennial', 'decennial']
例句：
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1.The institution celebrated its semicentennial anniversary last year.
该机构去年庆祝了其半世纪周年纪念。
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2. The team has been together for a decade and is celebrating their quinquennial reunion.
这个团队已经在一起工作十年，正在庆祝他们的五周年团聚。
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3.The museum exhibits a collection of artifacts from the past five decades.
博物馆展示了过去五十年的文物收藏。