1. Tshawb xyuas los ntawm qhov yuam kev ntawm tus neeg teb xov tooj. Tus neeg teb xov tooj tsis paub txog cov khoom siv ua haujlwm ua rau cov khoom siv tsis ua haujlwm, uas yog qhov laj thawj tseem ceeb ntawm kev txo qis kev ua haujlwm ntawm lub tshuab ziab khaub ncaws. Tsis tas li ntawd, kev saib xyuas tsis zoo ntawm cov khoom siv los ntawm cov neeg ua haujlwm kuj yog ib qho laj thawj rau kev txo cov khoom siv. Piv txwv li, cov khoom siv lubricating roj tsis ntxiv rau lub sijhawm, thiab cov khoom hnav tsis tau hloov thiab kho raws sijhawm, txhua yam ua rau lub tshuab ziab khaub ncaws. Yog vim li cas thiaj txo tau kev ua haujlwm.
2. Tshawb xyuas los ntawm qhov xwm txheej ntawm cov khoom siv nws tus kheej. Cov tshuab ziab khaub ncaws ib txwm muaj qee qhov teeb meem me me thaum lawv ua haujlwm, tab sis cov teeb meem me me no yog cov laj thawj uas cuam tshuam rau kev ua haujlwm ntawm cov khoom siv, xws li: xoob qhov chaw, ua rau hnyav hnyav ntawm cov khoom siv; Lub interface tsis nruj nreem kaw, uas txo cov cua ntim hauv cov khoom siv; cov khoom siv accessories tsis raug ntsia rau hauv qhov chaw, lub tshuab yog overloaded, thiab hnav yog hnyav. Cov no yog tag nrho cov laj thawj rau kev txo qis kev ua haujlwm ntawm lub tshuab ziab khaub ncaws.
