translation.en: The physical model, on the other hand, is 2,700 layers, one millimeter thick, it weighs 700 kilos, it's made of sheet that can cover this entire auditorium.
translation.zh: 另一方面，这个实体模型 有2700层1毫米厚的叠层 重约700公斤，是用可以覆盖这整个礼堂 的薄板做成的