1. mautu lelei ma umi faʻaaogaina le ola.
2.Structure e faigofie ma faʻatusatusa.
3.Saving avanoa ma faigofie ona faʻafesoʻotaʻi ma PCB.
1. Lelei mautu ma umi faʻaaogaina le ola.
2. O le fausaga e faigofie ma fa'atusatusa.
3. Faʻasaoina avanoa ma faigofie ona faʻafesoʻotaʻi ma PCB.