long-lost
adjective [ before noun ] uk/ˈlɒŋ.lɒst/ us/ˈlɑːŋ.lɑːst/
失踪很久的;很久不见的
used to refer to a relation, friend, or object that you have not seen for a long time
my long-lost cousin 我那很久未见的表弟
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