Peb tuaj yeem kho qhov kev sojntsuam thiab txuas qhov chaw raws li qhov loj ntawm cov khoom siv ntsuas cov pa oxygen thiab dej vapor raws li tus neeg siv xav tau.
Ntxiv rau kev muab cov khoom lag luam thiab cov kev pabcuam dav dav, peb kuj muab cov neeg siv nrog kev tshuaj xyuas, kuaj xyuas, thiab tsim cov kev daws teeb meem tshwj xeeb rau cov neeg siv cov teeb meem nyuaj.
