Hauv kev tsim kho cov kav dej ntev, nrog cov kab hlau muaj feem cuam tshuam loj, raws li qhov xwm txheej ib txwm muaj, 35% mus rau 40% ntawm cov kab yeeb nkab kev nqis peev suav rau tag nrho cov peev txheej.Yuav ua li cas xaiv tus nqi tsim nyog, kev ua tau zoo ntawm cov yeeb nkab yog qhov tseem ceeb tshwj xeeb, ib qho ...
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