It doesn't matter if you check the duplicate of HowNet, because you must add a number in the upper right corner of the quoted text. At the end of the paper, the documents corresponding to each number are listed. When HowNet checks the duplicate, it will automatically identify the reference symbol and remove the reference text.

In addition, if you don't trust to check the duplicate, you can buy a HowNet in Taobao to check the duplicate. I remember close to 100 yuan. Although HowNet keeps saying that only their own thieves are genuine, Taobao's is also genuine. This is what your school official knew when he checked the weight. Taobao bought it. If the school checks again, it will show that HowNet has checked once before.