Tsis txhob pib ntaus ntawv ntau zaus
Vim tias txhua zaus koj pib, cov cuab yeej yuav tsum muaj kev sib kho kom pom tseeb, tsis tas yuav siv sij hawm, tab sis kuj txheeb tus tu lub taub hau, rau tus number case delivery system, nws yog tsis tshua muaj kev txuag tau qee tus cwj pwm, nws yog qhov preferable tig thiab tawm ib zaug ib hnub. 
