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1.三线建设指的是从______年到______年,我国在中西部的十三个省、自治区进行的一场以备战为指导思想的大规模基本建设。
1. The third-tier construction refers to a large-scale capital construction conducted by our country in the thirteen provinces and autonomous regions in the central and western regions from ______ years to ______ years for guiding ideological preparations.