Or you attend a mathematics class, and you have some trouble keeping up because the difficulty level is beyond you.
又或者，你去上数学课，由于难度级别超过了你的能力，让你觉得有些跟不上。
Mathematics teaching is a bilateral activity, fully excavating mathematics teachers competence and exerting their leading role in class are an important point in advancing teaching quality.
数学教学是一项双边活动，充分挖掘数学教师能力，发挥数学教师课堂的主导作用，是提高数学课堂教学质量的重要方面。
One day, Galileo happened to hear a mathematics professor teach a class about geometry.
一天，伽利略偶然听了一位数学教授讲的几何课程。
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