Nrog rau kev txhim kho thev naus laus zis, daim ntawv thov ntawm cov ntaub ntawv ua npuas ncauj tau dhau los ua ntau thiab siv ntau dua. Txawm hais tias nws yog cov khoom siv hauv tsev, cov khoom siv hauv tsev, lossis cov khoom siv hluav taws xob, peb tuaj yeem pom cov ntaub ntawv foaming. Yog li, dab tsi yog cov ntaub ntawv foaming? Cov ntsiab cai tshwj xeeb yog dab tsi? Dab tsi yog nws ...
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