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1970年元旦早晨,飘飘洒洒的瑞雪落满首都街头。北京建工集团六建公司助理工程师杨嗣信急匆匆来到单位,自愿替一
On the New Year’s Day in 1970, the snow-capped Rui Xue covered the streets of the capital. Yang Jianxin, an assistant engineer of Liujian Company of Beijing Construction Engineering Group, hurried to the unit and volunteered for one