1·Substitutions of one gesture for the other often create not only humorous but also embarrassing moments.
用一种手势替换另一种往往不仅仅会创造幽默，也会产生尴尬的时刻。
2·If you remove these tags, you will remove any existing references and substitutions.
如果您去掉这些标签，那么您将去掉所有现有的引用和替换。
3·The true power of these substitutions will become apparent in the next section.
这些替换的真正威力将会在下一节显现。
4·Inside this class file, we also have variable substitutions we want our users to customize.
在此类文件内，还有一些需要用户自定义的变量替换。
5·Remember, the preprocessor knows nothing about the C language and is just doing text substitutions.
记住，预处理器并不了解 C 语言的任何内容，它只是简单地进行文本替换。