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By oneself; without others present.
她决定单独去旅行。
She decided to travel alone.
请单独完成这项任务。
Please complete this task alone.
Often used to describe someone acting or existing without companionship.
Often used to describe someone working or traveling alone.
In formal contexts, it emphasizes independence; in informal contexts, it may imply loneliness.
From 单 (dān, 'single') + 独 (dú, 'alone').
Can be used to describe physical solitude or independence in actions.