Los ntawm kev xav thiab kev xav ntawm lub siab xav, cov yam ntxwv ntawm lub qhov rooj steel hlau yuav ua rau tib neeg muaj kev ruaj ntseg ntau dua, thiab kev ntseeg ntau dua ntawm lub qhov rooj steel hluav taws. Lub tiaj tus thiab du sab nrauv kuj tsim ib qho chaw niaj hnub thiab zoo nkauj tshaj li lwm hom qhov rooj.

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