在下午四点钟用英文怎么说

"In the afternoon at four o'clock" 用英语说就是 "at four in the afternoon"。

"In the afternoon" 是由 "in" 和 "afternoon" 组成，"in" 是介词，表示时间，"afternoon" 是名词，表示下午。

例句：

I will meet you at four in the afternoon. (我会在下午四点和你见面。)
I usually take a nap at four in the afternoon. (我通常在下午四点午睡。)
He arrives home at four in the afternoon. (他在下午四点到家。)