character spacing reference line

例句：

1. 1.The font size is set to a character spacing of 12pt.
   字体大小设置为12点字符间距。
2. 2. This is the reference line for the character spacing in the document.
   这是文档中字符间距的参考线。
3. 3.The designer used this line to guide the character spacing on the webpage.
   设计师使用这条线来指导网页上的字符间距。