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全校在大礼堂集合.
The whole school (was) assembled in the main hall.
边座,楼座剧院或大礼堂中为了增加座席,而从后面或侧墙突出的具有倾斜地板的上面部分
An upper section, often with a sloping floor, projecting from the rear or side walls of a theater or an auditorium to provide additional seating.