1. Eli va'aiga o le fa'aoga 1、Earthwork: E mafai ona fa'aogaina mea eli mo le atina'eina o le eleele, fa'alauleleia o le eleele, eli i luga ole auala, toe fa'atumuina o lua ma isi galuega.O tulaga o le fausiaina o le lalolagi e lavelave, ma o le tele o latou o galuega tatala, e aʻafia i le tau, hydrology, geology, ma faigata ona fuafua ...
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