1. Kev ncig xyuas thiab so: Qhov tshwj xeeb zoo li thiab hloov tau yooj yim tsim ntawm ntxaib -tis folding tsev ua rau nws yog qhov kev xaiv zoo tshaj plaws rau kev ncig xyuas thiab so. Hauv qhov chaw zoo nkauj, ntxaib- tis folding lub tsev tuaj yeem xa mus sai sai rau hauv lub tsev zoo nkauj, tso cai rau cov neeg ncig tebchaws tuaj yeem ntsib qhov chaw tshwj xeeb.
2. Lub tsev nyob ib ntus: Hauv cov xwm txheej uas yuav tsum tau muaj vaj tse nyob ib ntus, xws li cov chaw tsim kho thiab chaw puas tsuaj, lub tsev ntxaib - tis folding tuaj yeem nthuav tawm sai sai rau hauv qhov chaw nyab xeeb, ua tau raws li cov neeg xav tau kev nyob. Qhov kev xa tawm sai sai no ua rau ntxaib -tis folding lub tsev ua lub luag haujlwm tseem ceeb hauv cov xwm txheej tshwj xeeb no.
