This might be a persistent vegetative state with no possibility of turning it on, even in principle.

这可能是个持续性植物状态,即便原则上，都没有可能重启开关。

耶鲁公开课 - 死亡课程节选

So, there is no homework grade based on turning homework in.

你们交上来的作业,并没有分数。

麻省理工公开课 - 固态化学导论课程节选