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我国东北乌苏里边境横亘着侵华日军要塞,地下部分规模宏大,功能齐全,易守难攻。二战中在中苏合击下,
The border of Ussuri in northeast China runs across the fortifications of Japanese invaders invaded China. The underground part is large-scale and full-featured and easily defensible. Under the attack of China and the Soviet Union at World War II,