Dab tsi yog qhov tawg-pov thawj ua haujlwm

Cov kab hluav taws xob tiv thaiv tawg yog tsim los tswj kev ua haujlwm ntawm lub cev muaj zog, suav nrog pib, nres, thiab ua haujlwm nres thaum muaj xwm ceev kom tswj tau lub cev muaj zog.