life sentence

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He died of heart failure in 1971, while serving a life sentence.
斯坦格尔1971年死于心脏衰竭，当时他正服无期徒刑。
Eventual retirement looms not as a release but as a daunting life sentence.
最终的退休不会是一种解脱，倒像是令人畏缩的无期徒刑判决。
wuzengping.blog.163.com
On the one hand, when we thought that BPD was a life sentence, we avoided treating patients who can in fact be helped.
一方面，一想到BPD患者似判了无期徒刑，我们情愿避免治疗事实上可以得救的患者。

Libya has maintained that it was not responsible for the downing of Pan Am flight 103 and Megrahi, who was serving a life sentence, has maintained his innocence.
I don't want to be told that I could sit here for the rest of my life just sort of parsing one sentence. Don't tell me about that.
我可不想坐在这里学一辈子,就为了解读一个句子的意思，千万别这么告诉我。
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But his mother's claim that he is a 16-year-old juvenile could pose a problem for prosecutors seeking the maximum sentence of life imprisonment.

Sharif was give a life sentence for refusing to allow a plane carrying Musharraf to land.
NPR: Sharif's Return to Pakistan Poses Challenges

the punishment of being put in prison for a very long time, or, in the US, until death

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.