从染指渗透到聚积强势——以九一八事变前中国东北的日本人流为中心
종염지삼투도취적강세——이구일팔사변전중국동북적일본인류위중심
From Encroachment and Infiltration to Strength Buildup:Centered on the Stream of Japanese into Northeast China before the September 18 Incident