孤独

例句：

1. 1. She felt lonely when she was away from her family.
   当她离开家人时，她感到孤独。
2. 2.The old man lived alone in a small house.
   那位老人独自住在一个小房子里。
3. 3. They were both lonely and missed each other.
   他们都感到孤独，彼此思念。