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40周年 ウィキペディアから
ルビー・ジュビリー(英: ruby jubilee)は、40周年の記念日または記念式典を指す。
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.