So billboards and announcements in streets, around construction sites, in subways, in the back of cabs,... speak to me in an abstract language.
所以街上、建筑工地周围、地铁里、出租车后面等地方的公告栏或告示，对我来说就是一种抽象的语言。
Abstract: today's building and other construction engineering need to make the necessary surveying and mapping.
摘要：当今的建筑和其他的施工工程都需要进行必要的测绘。
Abstract: in the process of project construction, because all sorts of reasons, engineering change situation happen from time to tome.
摘要：在工程建设过程中，由于各种原因，工程变更的情况时有发生。
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