There are four classes in the morning and four in the afernoon是什么意思?

There are four classes in the morning and four in the afernoon是什么意思?
There are four classes in the morning and four in the afernoon是什么意思?

There are four classes in the morning and four in the afernoon是什么意思?
早上有4节课,下午也有4节课

上午四节课，下午四节课。

上午和下午各有四节课。
上午四节课下午四节课。
and后面的four省略了classes，就是指代前文的重复内容。