1.Nws tsuas yog siv raws li phosphaplating tus neeg sawv cev rau cov hlau los tiv thaiv xeb, tshwj xeeb tshaj yog tsim nyog rau kev tiv thaiv xeb ntawm cov khoom siv ntau.
2.Nws siv tau siv raws li lub rajricating txheej thiab cov txheej tiv thaiv rau ntau yam riam phom hauv kev tiv thaiv kev lag luam hauv national.