Lub qhov rooj hluav taws steel yog ruaj khov heev. Nyob rau hauv txoj kev siv tiag tiag, lub qhov rooj hluav taws steel tsis yooj yim rau kev puas tsuaj los ntawm sab nraud, uas tuaj yeem tiv thaiv cov khoom siv sab hauv.

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