1. 无期徒刑；终身监禁
If someone receives a life sentence, they are sentenced to stay in prison for the rest of their life, or for a very long period of time.

e.g. Some were serving life sentences for murder.
有些人因为谋杀罪在服无期徒刑。

noun

1. a prison term lasting as long as the prisoner lives

e.g. he got life for killing the guard

Synonym: life