2。 Printing means how many sheets of paper are needed to print this book.

3。 Insert refers to the number of pages inserted into the book block to supplement its content integrity because of the need of the number of words in the book block and the arrangement of charts.

4。 Version is the publication time of the same book. The book published for the first time is called "first edition" or "first edition", and the book published after revision is called "second edition" or "second edition".

5。 Print run is the cumulative number of times each version of a book is printed.

6。 Print run refers to the cumulative print run of a book.