Lub tawb nqa khoom yog lub tsheb thauj neeg uas raug thawb thiab rub los ntawm tib neeg lub zog; nws yog yawg koob ntawm txhua lub tsheb. Txawm hais tias handcart cov ntaub ntawv tuav technology tau tsim tas li, handcart tseem yog ib qho tseem ceeb ntawm kev thauj mus los.
1. Kuv lub tawb nqa khoom yog feem ntau me me, ua rau nws tsis yooj yim thiab tsis ruaj khov thaum nqa khoom loj. Lub thav duab tuaj yeem txhim kho kom tso cai rau txuas ntxiv thiab thim rov qab.
2. Yuav kom thawb lub laub yooj yim dua thiab tsis muaj zog, lub thav duab tuaj yeem folded ntawm ib lub kaum ntse ntse.
3. thawb lub laub nqes hav yog ib txoj haujlwm nyuaj heev; nws yooj yim rau taw. Qhov no yog qhov tseeb tshwj xeeb hauv cov chaw tsheb ciav hlau uas muaj neeg coob. Tus neeg twg uas tau siv lub tawb nqa khoom tuaj yeem cuam tshuam. Ntxiv ib lub braking ntaus ntawv yuav txo tau qhov kev ntxhov siab thaum mus downhill.
