Tsis ntev los no, nws tau tshaj tawm tias hom khoom noj tshiab tau nrov hauv khw - cov khoom noj khov-qhuav. Cov khoom noj khov-qhuav yog ua los ntawm cov txheej txheem hu ua khov-drying, uas yuav tshem tawm cov dej noo ntawm cov zaub mov los ntawm khov nws thiab tom qab ntawd ziab kom tiav. ...