Dab tsi yog qhov zoo ntawm kev siv lub tshuab lim dej tsis siv neeg rov qab?
Tsis siv neeg rov qab ntxhua khaub ncaws lim r yog cov khoom lag luam ntawm cov khoom siv hluav taws xob. Nws muaj qhov zoo ntawm kev tsim tsim nyog, pom kev ua haujlwm siab, tsis tshua muaj nqi khiav