Twenty-four hours make a day.

二十四小时为一日。

《新英汉大辞典》

He's on duty twenty-four seven.

他不分昼夜地天天上班。

《牛津词典》

They have extended the deadline by twenty-four hours.

他们已经将最后期限延长了24小时。

《柯林斯英汉双解大词典》

They also include workers in health care and emergency services, and people between six months and twenty-four years of age.

VOA: special.2009.08.18

It argues that the books must be exactly twenty-four, because Revelation 4:10 has twenty-four elders in God's throne room.

它声称书的总数必须为24卷，因为启示录第四章第十节有24位老者,在上帝的正殿里。

耶鲁公开课 - 新约课程节选

So we have course one through twenty-four, although a few numbers are missing.

我们把课程从1到24进行了编号；虽然有几个号码缺失了。

MIT用数字说话 - SpeakingMax英语口语达人

U. government building that is protected by twenty-four-hour surveillance and a secure communications network.

NEWYORKER: Bring Up the Bodies

She pointed to the twenty-four-hour hospice call number that was taped beside her phone.

NEWYORKER: Letting Go

Twenty-four hours worth of video content are reportedly uploaded to YouTube every minute.

FORBES: Why Is TV So Much Work?