Qhov zoo ntawm folding khoom pob tawb

Piv nrog rau yav dhau los cov khoom siv yas pob tawb thiab cov pob tawb hlau, covfoldable khoom pob tawbmuaj qhov zoo sib xws. Lub teeb yuag thiab txuag hluav taws xob: Feem ntau ntawm cov pob tawb yuav khoom yog ua los ntawm cov ntaub tsis muaj dej, uas yog qhov hnyav dua li cov hnab yas thaum ntxov thiab cov pob tawb hlau.