China's Drama Theory Monographs is the earliest systematic drama monograph in China. Including lyrics, exercises, volume, living room, playing with utensils, drinking, planting, providing for the elderly and other eight parts, the content is more complicated, including opera theory, health preservation, garden architecture and so on.

I can only say that the content in the casual email is still the title of this book-leisure, which makes Teacher Liang feel "just what I want".

It can't be like the question you asked.

I suggest you read Casual Mail.