Nobody believes their body is going to die.

没有人相信自己肉体会死亡。

耶鲁公开课 - 死亡课程节选

They could mean nobody really believes they're going to cease to exist as a person, first possibility. Second possible claim, nobody really believes they're going to undergo the death of their bodies.

可以是说没人真正相信,他们会停止作为一个人存在，这是第一种可能，第二种可能是，没人真正相信,他们会经历肉体的死亡。

耶鲁公开课 - 死亡课程节选