Mechanically tswj cov nroj tsuag txhais tau tias saib tom ntej by Demin Alexey Lub rau hli ntuj 10, 2021 8 Txhawm rau kom tsis txhob muaj nqi rau kev tswj cov nroj tsuag, nws yog ib qho tseem ceeb uas yuav tau saib mus deb heev nrog kev tswj cov nroj tsuag.