Ukubumba ukuvuthela, okwakwaziwa njengokubumba umngxuma wokuvuthela, kukukhula ngokukhawuleza kweplastiki.Inkqubo yokubumba ukuvuthela NgeMfazwe Yehlabathi II, amavili avuthelweyo aqale asetyenziselwa ukuvelisa iingqayi zepolyethylene ezixinene kancinci.Ngasekupheleni kwee-1950s, ngokuzalwa kwepoly-high-density poly...
Funda ngokugqithisileyo