所以这就来了，最后一个指令。

So here it comes, the big one.

youdao

CPI表示一个指令平均占用多少个周期。

CPI means how many cycles an instruction takes to complete in average.

youdao

这块代码内的，每一个指令。

If it does, then execute each of the instructions in that block.

youdao

The process to control it is intriguing and interesting but the heart of the computer is simply this notion that we build our descriptions, our recipes, on a sequence of primitive instructions.

这个控制它的过程很耐人寻味，很有意思,但是计算机的核心仅仅只是,我们在初始指令序列上，建造描述、方法的一个概念罢了。

麻省理工公开课 - 计算机科学及编程导论课程节选

That program counter points to some location in memory typically to the first instruction in the sequence.

程序计数器指示存储器当中的某些位置,尤其是指示序列中的第一个指令。

麻省理工公开课 - 计算机科学及编程导论课程节选

And I want to remind you, that block of code is a set of instructions, the same set of instructions that are going to be done each time through the loop.

我想提醒大家,这块代码是一个指令集,一个每次循环都会被执行的相同指令集,会变化的仅仅是变量的值。

麻省理工公开课 - 计算机科学及编程导论课程节选