Lub qhov rooj hluav taws xob feem ntau yog ua los ntawm cov hlau tsis muaj steel, nrog cov npoo du thiab tiaj tus, qhib tau yooj yim, ua haujlwm ntev, kev nyab xeeb thiab kev ntseeg tau. Tus kov ntawm lub qhov rooj hluav taws tuaj yeem ua tau raws li qhov hluav taws kub tiv thaiv kev ruaj ntseg nyob rau hauv ib lub sijhawm.

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