Raws li cov ntaub ntawv keeb kwm keeb kwm keeb kwm yav dhau los thiab phau keeb kwm keeb kwm chinology, qee lub pyramids muaj ua ntej Nau-as dej nyab, tab sis lawv tsis muaj pov thawj qhia txog kev ua kom dej puas tsuaj. Qhov no puas ua pov thawj tias tsis muaj dej nyab hauv phau npaiv npaum?