The colon's identifying a block of code.

冒号意味着一段代码的开始，这里的意思就是。

麻省理工公开课 - 计算机科学及编程导论课程节选

Chapters 17 through 26 then are a block of material that's referred to as the "Holiness code" because of its special emphasis on holiness.

7章到26章是一块,被称为“神圣的代码“的内容“,因为它侧重于神圣。

耶鲁公开课 - 旧约导论课程节选

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

So it feels a little backward mentally perhaps, 1 but this is saying, "do this block of code as long as n is less than 1."

所以它感觉可能有点迟缓，但是它指明，“只要n小于,执行这段代码“

哈佛公开课 - 计算机科学课程节选