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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One day after class, a student came up to me and recommended traditional Chinese medicine.

有一天课后，一个学生找到我，并向我推荐了传统中医。

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Not once did it occur to Michael that he could one day become a top student in his class.

迈克尔一次也没有想过有一天他会成为班里的尖子生。

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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 you walk into a class with 5th graders, who on day one are years behind where they should be and hate school and are kind of like to hate you because of it.

如果你走进一个五年级教室，学生们从第一天开始就落后很多,恨学校，因此也恨你。

哈佛公开课 - 幸福课课程节选

The one-day class covers the general principles of bread making and teaches a variety of techniques to help you create the perfect loaf.

BBC: Ten culinary weekends in Europe

Healy stopped Brewster in the hallway one day after class, with the seedling of an idea for selling electricity back to a grid, something he had chewed over with his father.

FORBES: Magazine Article

One day, his university class has the opportunity to sit in on a war-crimes trial.

ECONOMIST: The young writers�� holocaust