The while loop has three major pattern-matching sections.

白色的环有三个主要的模板匹配部分。

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When it discovers a loop, it displays three expressions: the initializer, condition, and iteration.

当它发现一个循环时，会显示三种表达式：初始程序、条件及迭代。

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In the case of a for loop, three additional data fields are generated.

对于for循环情况，会生成三个附加数据字段。

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So each time through the loop, I'm doing three steps. Three basic operations.

因此每次运行这个循环，我做了三次基本运算。

麻省理工公开课 - 计算机科学及编程导论课程节选

b times. So I've got to go 3 b steps. All right I've got to go through the loop b times I've got three steps each time, and then when I pop out of the loop, I've got two more steps. All right I've got the initiation of answer and the return of it.

好，我一共执行了b次循环,每次循环内部进行了三次基本操作,当跳出循环后还有两个基本操作，因此这个初始的答案就是,2+3b次基本操作,来完成这个循环。

麻省理工公开课 - 计算机科学及编程导论课程节选

No one goes to the Indy 500 just to see cars go in a loop for three hours.

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Cost savings through scale are difficult when planes are tied to separate maintenance schedules and pilots need to be taken out of the productive loop for three months for retraining.

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Similarly, the British-era light-rail loop circling Yangon takes about three hours to ride once around, with no linking bus services into downtown.

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