下午 + Time/Activity
下午 (xiàwǔ) is a noun meaning "afternoon," referring to the period of the day from noon until evening. It is placed before a time or activity to indicate when something happens. For example, 下午三点 means "3 PM."
下午两点我有一个会议。
xiàwǔ liǎng diǎn wǒ yǒu yī gè huìyì.
I have a meeting at two o'clock in the afternoon.
今天下午天气不错,我们去散步吧。
jīntiān xiàwǔ tiānqì búcuò, wǒmen qù sànbù ba.
The weather is nice this afternoon; let's go for a walk.
她每天下午都去图书馆学习。
tā měitiān xiàwǔ dōu qù túshūguǎn xuéxí.
She goes to the library to study every afternoon.