求翻译：The required two-dimensional image to be generated by the production of standard AutoCAD engineering drawings. This requires that relevant personnel must master prior to making three-dimensional reconstruction of the standard method of making engineering drawings or to provide adequate material standard engineering drawings, such an approach has been engineering for AutoCAD drawings of the buildings or parts is very good, because It can draw accurate results. However, this is no drawing for some applications, such as three-dimensional reconstruction of ancient buildings becomes difficult to achieve.是什么意思？

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