User talk:110.140.6.41

September 2021
Hello, I'm Cassiopeia. I wanted to let you know that I reverted one of your recent contributions—specifically this edit to Science and technology of the Yuan dynasty—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks.  Cassiopeia  talk  07:29, 4 September 2021 (UTC)