You've got to do it above this chunk of code, you've got to do it inside this chunk of code.

你不得不在一大段代码之上来实现它，你不得不在一大段代码之内来实现它。

哈佛公开课 - 计算机科学课程节选

This chunk of code and this chunk of code, they're really doing the same thing.

这一块代码和这一块代码，它们实际上是相同的功能。

麻省理工公开课 - 计算机科学及编程导论课程节选

So conceptually the key difference here, besides the syntax looking slightly different, it just means that if you want a chunk of code to execute no matter what initially, ; you can use the do while loop; if you want to check a condition first, you can use the while loop.

所以概念上，则关键的区别是，除了语法看起来有点不同，它的意思是如果你想要一段代码,最初无论如何都要执行，你就可以用do，while循环;,如果你想要先检查条件，你可以用while循环。

哈佛公开课 - 计算机科学课程节选

Suppose I want to compute square roots a lot of places in a big chunk of code.

假设我想在一大段代码中,计算很多次平方根。

麻省理工公开课 - 计算机科学及编程导论课程节选