Dov lub nra hu ua dab tsi?

Lub hnub nyoog ntawm tus me nyuam npaj rau kev cob qhia potty tuaj yeem sib txawv ntawm ib qhoRolling nrafeem ntau hu ua "rolling suitcases" los yog yooj yim "rolling luggage" nyob rau hauv nrov parlance. Xwb, lawv qee zaus hu ua "dov hnabTag nrho cov ntsiab lus no hais txog lub nra ntawm lub log thiab lub log rov qab, tshwj xeeb yog tsim los kom rub tau yooj yim los yog dov nrog, yog li tshem tawm qhov xav tau nqa lawv manually. ntawm kev mus ncig, tso cai rau tib neeg txav mus loslawv lub nranrog yooj yim dua thiab siv zog tsawg dua lub cev.