国家利益变迁与苏俄在中东铁路问题上态度的变化——以苏俄发表第一次对华宣言为例
국가이익변천여소아재중동철로문제상태도적변화——이소아발표제일차대화선언위례
The changes of benefit of the country and the change of the attitude of Soviet Russia on the Chinese East railway -- Taking the Soviet Union' s First Declaration to China as Example