Ahem, this is the preface and notes.
If you are really too lazy to read the following content, then just understand that this is a column of reflections after reading the article.
Usually I don't say anything when reading articles, but when I saw a reader/author's reading record, I would like to share my feelings and mood while reading the article.
Please note that since this is not a review, the content is very subjective. I write the record from the perspective of a reader...