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alone; by oneself; unaccompanied; unaided; single-handed; without one's family
彼は単身で故郷を離れた。
He left his hometown alone.
若い彼は単身で海外市場に乗り込んだ。
The young man ventured into the overseas market alone.
記者は単身、紛争地域へ取材に向かった。
The reporter headed alone to the conflict zone for coverage.