One day in class, the teacher held up an apple.

一天在课堂上，老师举起一个苹果。

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This summer, Wilson Wong will lead a class of rising fifth-graders at a day camp dedicated to Chinese culture and the Chinese American community in Oakland, California.

今年夏天，威尔逊·王(Wilson Wong)将带领一个五年级新生班级参加一个以中国文化以及华裔群体为主题的日间夏令营，该夏令营在在加利福尼亚州奥克兰市举办。

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It seems to me that a compromise would be receiving the exam questions a day or two in advance, and then doing the actual test in class the ticking clock overhead.

在我看来，一个折衷的办法是提前一两天收到考题，然后在课堂上计时做实际的测试。

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On their first day of class in the fall of 2007, we have 41 students in our class this year.

007年秋天，开课第一天，今年一共收录41名学生。

哈佛公开课 - 幸福课课程节选

So I'm in class a lot of the day from about like 9 to 6,

所以我一天有很多时间在上课，大概从早晨九点到下午六点，

和戏剧专业的朋友 - SpeakingMax英语口语达人

And he--one day this boy showed up in the class-- this was during Vichy, about 1943, maybe it's '44, and he's new and he's not different, he's just not from there.

他,有一天班里来了个新同学,当时是维西政府时期,1943年,也可能44年,他是新来的也没什么特别之处,只是不是当地人

耶鲁公开课 - 1871年后的法国课程节选

If the weather clears up, but you close the school, people will feel their children could have spent the day in class.

BBC: School closures

Every day for two years, students are given three cases a day to read and analyze, and then discuss with their fellow classmates the next day in class.

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My teenage son has been staying up until one and two in the morning to finish his homework , and then falling asleep in class the next day.. Thank goodness he recently came up with a possible fix: SelfControl, a free app he has installed on his computer.

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