Dab tsi yog cov ntaub zoo tshaj plaws rau npog qhov chaw ntawm cov ntaub hnab nyees khawm?
Dab tsi yog cov ntaub zoo tshaj plaws los npog cov ntaub ntawm qhov chaw ntawm lub hnab ntaub khawm (uas yog, cov ntaub zoo tshaj plaws los npog lub khawm yog dab tsi)? Cov neeg siv khoom feem ntau yuav nug cov lus nug no vim lawv tsis paub txog kev siv tshuab ntawm cov ntaub hnab khawm. Lawv ib txwm xav tsis thoob tias cov ntaub twg yog qhov zoo tshaj plaws rau kev qhwv. Nov yog ib txoj hauv kev yooj yim ntawm kev xaiv ntaub:
Ua ntej ntawm tag nrho cov, cov ntaub xav tau los ntawm tus tsim qauv yuav tsum yog qhov haum tshaj plaws. Txawm hais tias nws tsim nyog rau kev ua cov hnab ntim cov nyees khawm, peb tuaj yeem pom tias cov ntaub yog elastic (expandable). Feem ntau cov ntaub yog ntau dua los yog tsawg dua elastic, tab sis kuj tseem muaj cov ntaub uas tsis muaj elasticity, xws li cov ntaub ntawv tsis muaj dej tsis zoo thiab hluav taws kub (xws li raincoats), uas ua rau wrinkles los yog qhov tsis sib xws ntawm qhov chaw thiab sab ntawm cov nyees khawm. Yog li ntawd, peb yuav tsum ua cov ntaub ntawv zoo li no tom qab kev kho mob tshwj xeeb, tab sis tsis muaj cov duab tuaj yeem ua tiav cov txiaj ntsig zoo.
