Scope ntawm kev siv
Nws yog tsim rau auditoriums, theaters, auditoriums, lecture halls thiab lwm qhov chaw. Yuav tsum muaj txoj kab pom zoo thaum lub rooj sib tham thiab kev ua yeeb yam, thiab cov rooj zaum yuav tsum yooj yim siv.
Kev tu thiab tu yuav tsum ua kom yooj yim siv, kom cov neeg tsis yooj yim nkees.
