Getting up at four o'clock every morning is sheer purgatory.

每天早上四点起床简直是活受罪。

《牛津词典》

I got up at four o'clock.

我四点钟起床。

youdao

It is four o'clock.

现在是四点钟。

youdao

She was nineteen. Those who knew Ida Tarbell in college say she would wake up at four o'clock in the morning to study.

VOA: special.2010.04.25

When I had made an end of these labors, it was four o'clock in the morning.

VOA: special.2009.05.16

It was four o'clock in the afternoon when Paul woke up.

VOA: special.2009.04.11

It was four o'clock in the afternoon and the kitchen was square and gray and quiet.

NPR: Excerpt: 'The Member of the Wedding'

Had you arrived from Mars at around four o'clock a couple of Saturdays back, you would have wondered what all the fuss was about.

BBC: Chick Young's view

Then, at four o'clock in the afternoon, twenty-four hours after the mortar fell on his friends and neighbors while they waited to buy bread, he will bend down and pick up his bow.

NPR: Excerpt: 'The Cellist Of Sarajevo'