Ib ntu ntawm cov roj nplua nyeem cov yeeb nkab hauv qee yam ntawm lub cav muaj ntau qhov kev sib tsoo ntawm qhov kev ua haujlwm, uas tau tshwm sim los ntawm ntau qhov kev teeb tsa tsis zoo.
Vim tias nws tuaj yeem yog khoov rau ntawm qhov yuav thiab qhov kev ntxhov siab sab hauv tsim los ntawm khoov hauv qab ntawm qhov ntsuas lub vojvoog yog qhov tsawg heev, nws tuaj yeem coj tau yooj yim rau txoj haujlwm ua haujlwm thiab tseem tuaj yeem lav qhov ua haujlwm nyab xeeb ntawm cov kav dej. Qhov no yog qhov laj thawj tseem ceeb vim li cas qee cov raj xa dej yuav tsum siv cov hoses hlau.
