Nws yog dav siv nyob rau hauv ntau yam kev lag luam zoo tib yam
Haum rau qhov loj me thiab qhov chaw ntxhib qhov chaw sib txuam roj foob qhov (ceeb toom: thaum sealing tsis tshua muaj viscosity nruab nrab thiab roj, cov nyhuv sealing zoo li qub ntawm ntug sab nrauv ntawm cov pob txha hlau thiab sab hauv ntawm cov kab noj hniav yog txwv.)