On a math lesson 上一堂数学课
On a serious math lesson 在一节严肃的数学课上
a math lesson
数学课
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In the afternoon we have two math lessons and one music lesson. Math is difficultbut I study hard. And we sing a beautiful song.
在下午我们有两个数学课程和一个音乐的教训。数学是困难的但我努力学习。我们唱一首优美的歌曲。
youdao
Aimed at children between the ages of eight and 12, the projects inside each package teach a basic lesson in science, technology, engineering or math through a hands-on experience.
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