转载自：http://blog.sina.com.cn/s/blog_93ce7dc501011135.html
https://wenku.baidu.com/view/32a4125ecfc789eb162dc81c.html
tecplot中的各种标注都是类似于html文件的格式，如下：
粗体 <b>...</b>: Draw the enclosed characters using bold (if possible
斜体 <i>...</i>: Draw the enclosed characters using italics (if possible).
下标 <sub>...</sub>: Draw the enclosed characters as subscripts
上标 <sup>...</sup>: Draw the enclosed characters as superscripts.
希腊字母 <greek>...</greek>: Draw the enclosed characters using the Greek fon
数学符号 <math>...</math>: Draw the enclosed characters using the Math font
特殊符号 <userdef>...</userdef>: Draw the enclosed characters using the User-Defined font.
比如<greek>h</greek><sub>0</sub> 就是 η0