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求翻译,急!It is further necessary to specify the functional unit

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求翻译,急!
It is further necessary to specify the functional unit for costs,which in accordance with the German DIN 277 \x01DIN 2005\x02 standard,is the gross external floor area. “The gross external floor area is the sum of all floor areas of all ground projection plans of a building. This does not include the surface areas of unusable
roof space and crawl spaces that are necessitated by the design.The gross external floor area is made up of the area of internal divisions and external constructions and the gross internal floor area” \x01DIN 2005\x02.
按照德国DIN277DIN2005标准,有进一步必要设定成本的功能单元,就是总外部楼面面积.“总外部楼面面积是指建筑物的所有地面投影面积的总和.这不包括设计必需的不可用的屋顶空间表面积和爬行空间的表面积.总外部楼面面积由内部区域、外部结构以及总内笼面积组成”德国标准2005(规定).
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