变量可以是前述每种转换类型的源和目标。

A variable can be a source and a target for each of the transform types described earlier.

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每一个转换都是用识别转换类型的方法调用来配置的。

Each transformation is configured using a method call that identifies the type of transformation.

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syntax - rules是要采用的转换类型。

Syntax-rules is the type of transformation being applied.

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Well I need to take that number and I'm going to turn it into a string. So notice what I'm going to do right here. I take that number and convert it into a string. That's an example of that type conversion we did earlier on. By doing that it makes it possible for me to treat it as an ordered sequence of characters.

我可能得把这个数字变为字符串,请注意我这里是怎么做的,我把这个数字,转化为字符串了,这是我们之前学过的,类型转换的例子,这么一来我就能把它按照有序的。

麻省理工公开课 - 计算机科学及编程导论课程节选

We've got what's called type conversion.

我们用到了被称作类型转换的方法。

麻省理工公开课 - 计算机科学及编程导论课程节选