p.s. This chain of tweets is a part of my discussion in some emails with researchers and professors. Sorry for my poor English in a short time.

p.s.
This chain of tweets is a part of my discussion in some emails with researchers and professors. Sorry for my poor English in a short time.

— Dr.(Shirai)Hakase #StayHome🦠 (@o_ob) May 31, 2021

from Twitter https://twitter.com/o_ob