Translation

• by oneself (without assistance)
• alone (without company)

Examples

• 没有一个人能做到这一点。
  No one man could do it.
• 为了救许多人牺牲一个人是否道德？
  Would it be ethical to sacrifice one person to save many?
• 你是一个人来这儿的吗？
  Did you come here alone?
• 这条狗几乎是一个人。
  This dog is almost human.