Kev qhib thiab kaw ntawm lub qhov rooj steel hluav taws yuav tsis cuam tshuam rau tus cwj pwm ntawm lwm tus, uas tuaj yeem tiv thaiv ntau tus neeg uas tsis yooj yim txav los ntawm kev thaiv los ntawm ntau yam khoom siv lossis cov chaw, kom tsis txhob muaj xwm txheej.

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