Cov kab tsim iav ntab feem ntau pib qeeb dua qhov kev hloov pauv ntawm tus nqi, yog li thaum tus nqi tsis muaj zog tab sis pib lossis tsis poob qis, qhov ceev ntawm daim ntawv cog lus muab khoom lossis hauv lub sijhawm luv luv tsawg dua qhov ceev ntawm kev thov poob qis, cov khoom muag yuav txuas ntxiv mus. Tab sis vim yog cov kab tsim iav ntab, siv tus lej ruaj khov ntawm ib xyoos li 8 txog 10 xyoo, ncav cuag tus lej ruaj khov ntawm ib xyoos yuav tsum tau txias, qhov kev thov thiab tus nqi ua raws li qhov tsis muaj zog ntxiv ua rau ib nrab xyoo tom ntej ntawm kev lag luam iav, kom ceev nrooj thawj ib nrab ntawm kev kho mob txias tag nrho, lub sijhawm tsim khoom kho mob txias lossis qeeb, kom yaj ntawm cov khoom tsim tawm yuav poob qis maj mam.

Zuag qhia tag nrho, peb xav tias ib nrab ntawm cov iav ntab hauv Tshuag yuav txuas ntxiv mus nce tom qab qhov chaw ntawm lawv qhov chaw tam sim no siab thiab volatile thiab yuav tsum ua raws li iav yav tom ntej ua ntej kev tsim khoom pib tshwm sim sharply downward sib.