Yog lawm, peb muaj cov lauj kaub cais pawg me me, cov npua cais pawg kuj tseem tuaj yeem siv rau cov menyuam nyuj, ua los ntawm polyethylene, tiv thaiv erode, tiv taus kub ntau dua, yooj yim txav cov nyuj.
Cov menyuam yaus txheeb cov vaj huam sib luag yog sib npaug tes tuav rau saum thiab ob sab, nws yooj yim siv. kuj muaj 3 qhov sib txawv sib txawv rau kev xaiv: