ESL is a class period everyday.

ESL是一门每天都会上的课程。

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Travel was arduous and costly throughout the period, possible only for a privileged class—the same that produced gentlemen scientists, authors, antique experts, and patrons of the arts.

这整个时期里的旅行是艰辛、昂贵的，可能只有享有特权的阶级才能旅行，同样也是这个阶级造就了有教养的科学家、作家、古董专家和艺术赞助人。

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Note: Be sure to enter a period after custom in the class name.

注意：确保在这个类名称的自定义之后键入一个点符号。

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Things started to change probably on the first day of class, but not entirely-- because there's shopping period and it's such a wonderful thing-- you shop for classes.

事情也许从开课第一天就发生变化，但没有完全不同-,因为这是购物期，妙不可言的阶段-,你们选择课程。

哈佛公开课 - 幸福课课程节选

Before the Flip, the teacher looking to introduce video production into his course would have had to dedicate a whole class period to showing students how to operate the camera.

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We put them on an education assembly line every day, starting with one station that teaches them a certain subject before automatically moving them to the next class after a certain period of time.

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Then he slipped up, citing the Einhorn report that came out a year after his class period ended.

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