On these days, when I want to update my arch, it tells me "no responsity site to connect".
I check a lot of forums, and get no answers.Until my checking the Youtube, a Chinese Youtuber(whose name is ledis教程) teaches me how to solve the problem.
sudo pacman -S archlinux-keyring
Using the command to update the mirror's keying, then I can update my arch as usual.
