遵守课堂纪律，认真对待每一门课。
幸运的是，我们不是每一门课都要考试。
假若你得学习三四门课，便不可能为每一门课的课前准备都花上足够的时间。
If you have three or four subjects to study for, you're not going to be able to devote enough time to each subject in order to be well prepared for each class.
今天看了自己每一门课的介绍和要求，看到有点心慌慌，好像门门都很难，很容易不及格。
Today I reviewed the introduction of my courses and felt rather panic.
有一整个学年，我儿子的成绩表现一直不上不下，数学方面如此，甚至还有英语，看起来似乎每一门课都是如此。
There was an entire elementary school year in which my son got consistently mediocre grades in math, in English, in everything, it seemed.
有一整个学年，我儿子的成绩表现一直不上不下，数学方面如此，甚至还有英语，看起来似乎每一门课都是如此。
There was an entire elementary school year in which my son got consistently mediocre grades in math, in English, in everything, it seemed.
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