"Four o'clock" 英语是 "four o'clock"。来源是来自于传统的时钟，四点钟的时候，时针会指向第四个小时刻度。

例句：

It's four o'clock. 现在是四点钟。

The meeting is at four o'clock. 会议在四点钟举行。

I'll see you at four o'clock. 我们在四点钟见。