Lub qhov rooj hluav taws kub steel yog ua los ntawm cov khoom siv hlau los ua lub qhov rooj, lub qhov rooj nplooj ncej thiab vaj huam sib luag.Lub sab hauv yog ntim nrog cov khoom tsis muaj tshuaj lom thiab tsis muaj teeb meem hluav taws kub thiab cov khoom siv hluav taws xob.

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