"5:00 PM" 用英语说是 "five o'clock in the afternoon"。
其中 "five o'clock" 是指下午五点钟，"in the afternoon" 是指在下午。
来源：英语中使用 "o'clock" 表示钟点是一种传统用法，可以追溯到 16 世纪。
例句：
I'll meet you at five o'clock in the afternoon. (我会在下午五点钟见到你。)
The movie starts at five o'clock in the afternoon. (电影在下午五点钟开始。)
We should leave by five o'clock in the afternoon. (我们应该在下午五点钟之前离开。)