Daim ntawv thov

Los ntawm kev siv cov hloov pauv tsis siv neeg hauv cov neeg caij elevator, kev ntseeg tau thiab kev nyab xeeb ntawm elevator tuaj yeem txhim kho.Nws tuaj yeem ua kom ntseeg tau tias lub elevator tseem ua haujlwm ib txwm nyob hauv qhov xwm txheej ntawm lub zog tsis ua haujlwm lossis lwm yam xwm txheej ceev, ua kom muaj kev nyab xeeb thiab kev nplij siab ntawm cov neeg caij tsheb.Nyob rau tib lub sijhawm, qhov hloov pauv tsis siv neeg tuaj yeem ceeb toom rau lub sijhawm thiab muab kev sib txuas lus xwm txheej ceev, muab cov neeg caij tsheb nrog kev tiv thaiv kev nyab xeeb dua.