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the construction of the 3rd defence-line is one enormous industry_shift tide in CHina during Cold war, it is CHina's emergent preparation for the possbile WW III.
its aim was to set up a completely independent military-industry base in the heartland of CHina, to sustain CHina's prolong resistence against potentcial rivals such as Soviet or USA during the coming WW III.
the deepest yellow is the heartland of CHina, where "the 3rd defence-line" was set up.