求翻译：建筑面积为6000㎡。结构形式为框架结构，共五层，总高度为18.30m。除底层层高为3.9m外，其它层层高为3.6m。室内外地坪高差为0.60m。设计使用年限为50年是什么意思？

Floor area of 6,000 square meters. Structure for the frame structure, a total of five levels, the total is 18.30m. Among the underlying layer is a 3.9m things, other layers is a 3.6m. Indoor floor height difference in the field of 0.60M. The design life span of 50 years

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Floor space for 6000㎡.The structural style is the portal frame construction, altogether five, the gross altitude is 18.30m.Besides the first floor building store height is 3.9m, other building store heights are 3.6m.The room inside and outside grounds around a house elevation difference is 0.60m.The

Floor area of 6,000 square meters. Structure for the frame structure, a total of five levels, the total is 18.30m. Among the underlying layer is a 3.9m things, other layers is a 3.6m. Indoor floor height difference in the field of 0.60M. The design life span of 50 years

Building area of ​​6,000 square meters. Structure for the frame structure, a total of five, with a total height of 18.30m. In addition to the bottom storey of 3.9m, the other layers of height 3.6m. Indoor floor height difference field 0.60m. Design life of 50 years