Yingnan Liu. Construction and Practice of Primary School Research-based Learning Practice System from the Perspective of Core Literacy——Taking the Three Colors and Three Stages Research Learning Model of Harbin Jihong Primary School as an Example. erstp [Internet]. 2026 May 31 [cited 2026 Jun. 9];2(2):74-8. Available from: http://ojs.iajournals.cn/index.php/erstp/article/view/361