2. Lub chaw teeb tsa yuav tsum phim cov yam ntxwv ntawm lub cuab yeej
Cov khoom muaj npe zoo ntawm cov hluav taws xob ua hluav taws xob valve hais tias cov cuab yeej no tau tsim nrog cov yam ntxwv sib txawv kom muaj peev xwm hloov mus rau ntau cov xwm txheej hauv cov txheej txheem ntau lawm. Nws raug nquahu kom siv cov hluav taws xob hluav taws xob nrog cov pov thawj tawg thaum qhov chaw ib puag ncig tsis zoo, tawg thiab tawg; thiab thaum nyob hauv qhov xwm txheej ib txwm, koj tuaj yeem xaiv siv ob qho tib si. Yog li ntawd, tus qauv siv hluav taws xob yuav tsum tau xaiv raws li nws cov yam ntxwv ntawm lub cuab yeej thaum nruab thiab siv tus ntsuas hluav taws xob.
