您可以从 GCC 得到提示：为每个应用程序维护多个环境变量集，并根据手头的工作从一个集合切换到另一个集合。

You can take a cue from GCC: maintain many sets of environment variables per application and switch from one pool to another depending on the work at-hand.

youdao

在文章的稍后部分中讨论变量、相关集和每种类型的处理程序时，我们还会提到范围活动。

We'll revisit scope activities when we discuss variables, correlation sets and each type of handler later in the article.

youdao

范围活动允许您定义本地变量，本地相关集和各种处理程序。

A scope activity lets you define local variables, local correlation sets, and various handlers.

youdao

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

OK, I have another one in there, underbar, underbar, str.

创建一个变量值集，好，这里还有一个。

麻省理工公开课 - 计算机科学及编程导论课程节选