Infuriating! The human-taught version of the Japanese textbook actually appeared 731 illustrations, deliberately? Some netizens questioned: the cover of the Human-Taught Edition of Japanese textbooks actually has the word "731", and it is in order

Infuriating! The human-taught version of the Japanese textbook actually appeared 731 illustrations, deliberately?

Some netizens have questions: the cover of the Human-Taught Japanese textbook actually has the word "731", and it is arranged in order, is this a coincidence or intentional?

In addition, how can the crested ibis appear on the cover of Japanese textbooks, knowing that from ancient times to the present, the crested ibis was introduced to Japan from China?

And also.

Among the writers of the human-taught version of the textbook, three are actually from Japan, is this a prank they deliberately engaged in?

Is it really intolerable that a publishing house like Human Textbook has not found these problems? Who designed such an illustration? How were these textbooks reviewed? Can there be an answer to these questions?