Each class is 45 minutes in length.

每一节课为45分钟。

《牛津词典》

To our joy, some schools have provided each class with a piece of field to plant their favorite vegetables.

令我们高兴的是，一些学校已经为每个班级提供了一块田地，用于种植他们喜欢的蔬菜。

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Each class had unique characteristics.

每个班级都有其特点。

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Each class of 23 is taught by two full-time teachers (a public school would have one).

FORBES: Magazine Article

In each class, the facilitator introduces a health related topic to discuss with learners.

UNESCO: Country Profile: Cambodia

There were about a hundred boys in each class, and, with notable exceptions, we loved the place.

NEWYORKER: The Master