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。

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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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