In view of the fact that many friends have asked about the situation of physical books in recent days, the author hereby replied in a unified manner:

Due to the epidemic in the first half of this year, the work of the publishing house has been greatly affected, resulting in a slow progress of publishing, but despite all the difficulties, we still managed to push it to the last step (I have already seen the cover), and it will soon be available to meet the students.

The author will notify you during the pre-sale, so please don't be impatient.

"Dead on Mars" Notice about the physical book is being typed by hand, please wait a moment,

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