User talk:Xiaoyuxiang

January 2022
Hello, I'm LudicrousSengir. An edit that you recently made to Time dilation seemed to be a test and has been reverted. If you want to practice editing, please use your sandbox. If you think a mistake was made, or if you have any questions, you can leave me a message on my talk page. Thanks! Ludicrous (talk) 01:59, 21 January 2022 (UTC)

Please do not add or change content, as you did at Twin paradox, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. - DVdm (talk) 10:04, 21 January 2022 (UTC)

Note: Wikipedia does not accept preprint sources (see wp:RS), nor does it allow us to promote our own work (see wp:PROMO). - DVdm (talk) 10:08, 21 January 2022 (UTC)