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The roof structure is composed of steel trusses.
屋顶的结构是钢桁架。
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The roof is made of prefabricated steel trusses.
屋顶由预制钢桁架构成。
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The original roof trusses on the wall outside the cloister support.
原来屋架全靠墙外回廊上的木柱支撑。
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The original roof trusses on the wall outside the cloister support.
原来屋架全靠墙外回廊上的木柱支撑。
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