Second, the doctoral school did not sign a contract with HowNet.

Third, the doctor lacked confidence in his thesis, fearing that someone would find another job and quit HowNet. Most of the dissertations before 20 10 were not repeated, and the policy at that time did not require duplicate checking. According to the current standards, many doctoral dissertations have a high repetition rate, and they take the initiative to withdraw for fear that someone will make trouble.