Concentric casing system ma apaau

O le viliina o mea faufale ma mea matala, e le'i tu'ufa'atasia e masani lava ona o'o mai fa'afitauli e pei o le pu o lo'o pa'u i totonu pe pa'u.E faapefea ona aloese mai nei faafitauli?Faatasi ai ma le tele o tausaga o faʻataʻitaʻiga ma suʻesuʻega, ua matou atinaʻe le faʻapipiʻi faʻapipiʻi faʻapipiʻi ma apaʻau e faʻaoga mo le faʻavaeina o maʻa i le palapala, poʻo maʻa laiti laiti.Faatasi ai ma lona fausaga faigofie, faʻaogaina faigofie ma faʻatuatuaina faʻatinoga, o le concentric casing system ma apaʻau e mafai ona faʻagasolo faigofie le pusa mo le loloto i totonu ole 30 mita.E mafai ona toe maua ma e umi lona olaga.