中英释义：
双语例句
同学们正在上数学课。
The students are having a course in maths.
老师正在上数学课。
The teacher is explaining the math lesson.
重点词汇
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正在
in the process of; in the midst of; at the moment; in course of; in the act of; currently; presently
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数学
mathematics; math; maths; mathematical