yán / jiū / zhě / zhèng / zài / zhěng / lǐ / sū / lián / zhī / yǒu / shè / liú / xià / de / lì / shǐ / zī / liào

研究者正在整理苏联之友社留下的历史资料。

Researchers are organizing the historical materials left by the Society of Friends of the Soviet Union.