在下午的英文怎么写

例句：

一天的教学在下午4点左右结束。

The teaching day finishes at around 4pm

哦，那些书！我本来要在下午之前收起来的。

Oh, those books! I meant to put them away before this afternoon.

人体生物钟会让我们在下午1点到3点之间感觉没精打采、昏昏欲睡。

The body's natural rhythms mean we all feel dull and sleepy between 1 and 3pm.