many years ago, tens of thousands of infrastructure engineering soldiers rushed to the northwest of the motherland to participate in the construction of the third line. li laixi, who is now 104 years old, is one of them. on the gobi desert, where there is no bird flying in the sky and stones running on the ground, on the qilian mountains, which are three to four thousand meters above sea level, li laixi and his comrades overcome unimaginable difficulties. under the witness of the majestic and majestic posture of jiayuguan, the first gate of the great wall, they built an immortal monument with sweat and blood...
