heirloom       
noun [ C ] uk/ˈeə.luːm/ us/ˈer.luːm/
 传家宝,祖传之物
a valuable object that has been given by older members of a family to younger members of the same family over many years
  This ring is a family heirloom. 这枚戒指是家里祖传的。 
 
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