要对电子邮件的某一部分回复，你不得不手动引用该部分。
To reply to a subsection of an email, you have to quote that section manually.
definition字符串包含模板定义(电子邮件的静态部分)，它可以对外部变量(动态部分)进行引用。
The definition string contains the template definition (the static portion of the E-mail), which can make references to outside variables (the dynamic portion).
总的来说，下面这些选项应该是可配置的：电子邮件地址、CSS所使用的东西、从文件中引用的系统资源的位置以及图形元素的文件名。
In general, these items should be configurable: an E-mail address, what CSS to use, the location of any system resources referenced from files, and the file names of graphic elements.
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