[dān dú]
alone; by oneself; on one's own; single-handed; solo; independent
travel alone; single-handed journey
单独旅行
take independent action
采取单独行动
He has a room to himself.
他单独住一间屋子。
I want to have a talk with him alone.
我要和他单独谈一谈。
Nobody can do this job alone [by himself].
单独一个人干不了这个活。