Secondly, the theory and method of folding carton structure CAD system based on the method of piecing together are studied and discussed.
然后，重点研究和探讨了基于拼合法折叠纸盒结构CAD系统的理论和方法；
Secondly, the theory and method of folding carton structure CAD system based on the method of piecing together are studied and discussed.
然后，重点研究和探讨了基于拼合法折叠纸盒结构CAD系统的理论和方法；
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