名词
中文翻译：Unknown
同义词：
['failing classes', 'failing grades', 'unsuccessful classes']
例句：
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1. The school has decided to implement a new system for evaluating students' failure classes.
学校决定实施一个新的评估学生不及格班级的系统。
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2. The teacher noticed that some students were struggling in their mathematics classes, which led to a decline in their grades.
老师注意到一些学生在数学课上遇到了困难，这导致他们的分数下降。
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3. The student had failed several times in his history class, which made him feel discouraged and less motivated.
这个学生在历史课上多次不及格，这让他感到沮丧，失去了学习的动力。