第二个因素是被试内变量，即阅读材料的难度，分为容易、中等、难三个水平。

The second within-subject factor is difficulty, included three levels, easy, medium and difficult.

youdao

第二个因素是被试内变量，即阅读材料的难度，分为容易、中等、难三个水平。

The second within-subject factor is difficulty, included three levels, easy, medium and difficult.

youdao