这一偏好可以追溯到20世纪50年代的大跃进，在这场运动中，为了满足太过于乐观的钢铁产量目标，进而实现毛泽东的快速工业化梦想，炼出了大量废金属。
This predilection harkens back to the Great Leap Forward of the 1950s, when scrap metal was melted to meet wildly optimistic steel-production targets, thereby advancing Mao’s dream of rapid industrialization.