you cannot tell if computation will stop. For imagine we have a procedure called P
假设我们有一个名称为P的程序，该程序针对具体的输入的代码，能够让你知道，这段具体的源代码，和它所有的故障一起，最终是否会停止运行。
P: do you have a doctor, Shylock, to stop Antonio's blood?
鲍西娅：夏洛克，你是否请了医生来给安东尼奥止血呢？
Lots of schools do not have enough money, so they stop the P. E. classes first.
许多学校没有充足的资金，所以首先停掉了体育课。
Rather sensible to stop now, before I came down hard on them. P. 176.
现在停止非常明智，以免我对他们不客气。
Rather sensible to stop now, before I came down hard on them. P. 176.
现在停止非常明智，以免我对他们不客气。
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