翻译自Sass官方文档： http://sass-lang.com/documentation/file.SASS_REFERENCE.html#comments
Sass 支持标准的CSS多行注释以 /* */以及单行注释 //。在尽可能的情况下，多行注释会被保留在输出的CSS中，而单行注释会被删除。 例如：
/* This comment is * several lines long. * since it uses the CSS comment syntax, * it will appear in the CSS output. */body { color: black; }// These comments are only one line long each.// They won't appear in the CSS output,// since they use the single-line comment syntax.a { color: green; }编译为：
/* This comment is * several lines long. * since it uses the CSS comment syntax, * it will appear in the CSS output. */body { color: black; }a { color: green; }如果多行注释的第一个字母是 !，那么注释总是会被保留到输出的CSS中，即使在压缩输出模式下。这可用于在你生成的CSS中添加版权声明。
使用插值语句 (interpolation) ，可以将变量值输出到多行注释中，例如：
$version: "1.2.3";/* This CSS is generated by My Snazzy Framework version #{$version}. */编译为：
/* This CSS is generated by My Snazzy Framework version 1.2.3. */
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