Cardboard zaub sawv yog ua tau ib hom kev lag luam tshaj tawm hauv cheeb tsam cov khoom. Cov duab cardboard tuaj yeem siv rau hauv cov khw muag khoom, khw hauv khw, chaw khw, tsev khw, khoom lag luam yooj yim.
Bill board yog tus qauv loj lossis me sab nraum zoov kev tshaj tawm, feem ntau yog siv pem hauv ntej ntawm lub khw lossis chaw ua yeeb yam.
