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whereabouts; address
place of temporary residence
行方不明者の居所を探している。
They are searching for the whereabouts of the missing person.
容疑者の居所を特定するのに一週間かかった。
It took a week to pinpoint the suspect's whereabouts.
突然連絡が途絶えて、彼の居所が分からなくなった。
Contact suddenly broke off and his whereabouts became unknown.