Teaching philosophy has three levels: theoretical level, operational level, and subject level.
教学理念有理论层面、操作层面和学科层面之分。
The second within-subject factor is difficulty, included three levels, easy, medium and difficult.
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.
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。
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