研究人员注意到，海豚在确定答案时会很着急地按下踏板，但在难度高的测验中则表现出犹豫。
The researcher noted that the dolphin is quite eager to press the paddle when it was sure of the answer, but exhibited hesitation during difficult trials.
最后一组测验的难度水平与最初的一组相似。
The final round of tests was the same difficulty level as the initial test.
学习成效除受呈现方式影响外，还受学习任务和测验任务的难度和被试特征等因素的影响。
The performance in learning is influenced not only by the ways representation, but also by difficulties of tasks and examinations and other factors.
条目反应理论认为，每个测验条目有其自身固有的特征，比如难度、区分度等，这些特征与样本无关，也与其它条目无关。
Item Response Theory takes the hypothesis that every test item has its own features such as difficulty, discrimination and others, which are not related to the sample and neither to other items.
数学测验的难度对高一新生的数学学习兴趣的形成有决定性的影响；
The difficulty of math tests is the decisive influence of forming math-learning interest.
习题将不会计分，但是习题在深度和难度上会和测验中的题目相似。
These will not be graded, but the questions appearing on the problem sets will be very similar in depth and difficulty to those appearing on the exams.
习题将不会计分，但是习题在深度和难度上会和测验中的题目相似。
These will not be graded, but the questions appearing on the problem sets will be very similar in depth and difficulty to those appearing on the exams.
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