1. Enter the letter U and select it, then Format-Chinese Layout-Pinyin Guide. At this time, the "basic text" is "u", and the "pinyin text" on the right is used for input? , set Alignment to 0- 1-0, and set the font size as needed.

2. For this kind of text editing with mathematical formula, it is best to use Insert-Object-Microsoft formula x.x (if you don't have the function of Microsoft formula editor, you can download and install it yourself).