It's best to know about the first printing.

1. How many times is it printed?

The content, cover and typesetting of the book have not changed, but they are only printed normally after being sold by the publishing house. How many times do you distinguish between printing time and publishing time?

2. Which version is it about?

The content has not changed in principle, only the cover design and typesetting design (font size, page number, etc. ) may change.

The release time will also be based on the latest calculation.

3. Revised edition

Keep pace with the times and correct incorrect views, academics, etc. Or adding or deleting new terms, new content, new examples, etc.

In short, the content has been revised, and the release time is subject to the latest one.