Thaum Muaj Ntau Yam Siv Txuas Ntxiv

Ntau yam tshuaj ntxiv, qhov tseeb, feem ntau cov tshuaj ntxuav tu thiab quav ntxiv yog cov khoom xaiv. Txawm hais tias tus tswv tsheb xav kho lub tsheb zoo dua, tib cov khoom tuaj yeem daws tau ntawm tsuas yog 1/3 ntawm tus nqi ntawm ib lub chaw kho tsheb sab nraud. Qhov no yog cov khoom saib xyuas yooj yim Cov chaw uas muaj qhov loj tshaj" cov ntsiab lus ya raws" xws li roj tu kab, kuj yog ib qho kev saib xyuas cov khoom, tab sis feem ntau pom zoo rau cov tsheb ntau dua 20,000 txog 30,000 mais, thiab tsis tas yuav rau cov tsheb tshiab. Qhov tseeb, qhov tseem ceeb tshaj plaws yog kawm kom tsis kam.