Two intact EFL classes at Zunyi Normal College were involved in the study, with one randomly identified as the experiment group (the portfolio class).
遵义师范学院两个常规班级参与其中，其中一个被随意指定为实验班即写作档案袋班。
Chongqing Key Laboratory of Analytical Chemistry, Southwest Normal University; Department of Basic Chemistry, Zunyi Medical College; Department of Chemistry, Yibin College.
西南师范大学化学化工学院；遵义医学院基础化学教研室；宜宾学院化学化工系。
Chongqing Key Laboratory of Analytical Chemistry, Southwest Normal University; Department of Basic Chemistry, Zunyi Medical College; Department of Chemistry, Yibin College.
西南师范大学化学化工学院；遵义医学院基础化学教研室；宜宾学院化学化工系。
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