A maid brought me breakfast at nine o'clock.

一个女侍者9点钟给我送来了早餐。

《柯林斯英汉双解大词典》

The food, such as it was, was served at nine o'clock.

那饭虽说是粗茶淡饭，却到九点钟才端上来。

《牛津词典》

The shops usually open at nine o'clock.

商店一般在九点钟开始营业。

youdao

I left the hotel at nine o'clock the next morning to find Miss Adair.

VOA: special.2010.06.12

That will again be a Friday but it will be at nine o'clock and he will be here so I think that will be a lot of fun also.

那天会是一个星期五,但是会在9点开始并且他会来到这里,所以我认为届时会非常有趣。

耶鲁公开课 - 金融市场课程节选

Other areas, other people in retail, they go home like at nine, ten o'clock,

其他地区，干零售业的人都要九点十点回家。

比佛利山庄的购物街 - SpeakingMax英语口语达人

The staff were very good, very professional, but of course, when you find a door slamming at nine o'clock at night, it's not nice.

BBC: Sean Quinn Sr: Mountjoy prison spell was 'tough'

And from nine o'clock at night until seven o'clock in the morning, the doors at the end of residential corridors are locked.

BBC: Castle Huntly

Around eight or nine o'clock, the souks recently closed, the place is at its peak with thousands of people in the square.

BBC: Djemaa el Fna, the beating heart of Marrakesh