从1964年开始,数以千万计的热血青年怀着为国防军工事业奉献青春与生命的热情,离开自己的故土,来到偏僻山区,支持三线建设。当时的历史背景是上世纪60年代由于中苏关系恶化,边界事件和冲突不断,中央开始全国性备战,把重要企业和兵工企业大量内迁、新建。按当时情况,把沿海、沿边地区划为一线、次之为二线、陕西秦岭以南和四川、湖北等地为三线。 Starting from 1964, tens of millions of passionate youth, with the passion they devoted to youth and life for the defense industry, left their homeland and went to remote mountainous areas in support of the third-line construction. At that time, the historical background was that in the 1960s, due to the deteriorating Sino-Soviet relations, the continuous border incidents and conflicts, the Central Government started a nationwide war preparation and relocated and newly built important enterprises and armament enterprises. According to the situation at the time, the coastal and border areas were classified as first-line, secondly second-line, south of Qinling Mountains in Shaanxi and third lines of Sichuan and Hubei.