Hlau qhov rooj tsuas yog yuav tsum tau thawb qhib nrog tes, thiab tom qab ntawd nws yuav kaw ntsiag to thiab txiav, tsis muaj lub suab sib tsoo zoo li lub qhov rooj sab hauv thiab sab nraum lub qhov rooj, yog li tsim kom muaj qhov chaw nyob ntsiag to. Cov qhov rooj hluav taws steel muaj qhov nruj zoo.

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