只有二十四小时的有效期。

It's good for twenty-four hours only.

youdao

不到二十四小时的光景，伦敦就热闹开了。

In less than twenty - four hours London was abuzz.

youdao

在花园宾馆，每天确保有二十四小时的服务。

At the Garden Hotel, twenty-four-hour room service is guaranteed.

youdao

Eighty percent of atoms that are set up like that break down in the next 24 hours; 20 percent of them don't.

我们设定未来二十四小时中,有百分之八十的原子会分裂,另外百分之二十的原子不会

耶鲁公开课 - 死亡课程节选

What does that mean? Well, it means that, you know, there's maybe, let's say, that in the next 24 hours it will break down.

这意味着什么 好的,这意味着,就是说,有可能,这个原子会在未来的二十四小时内分裂

耶鲁公开课 - 死亡课程节选

You drive your car in, it shows you by the arrows where you go, you stop at window one to make your order and pay, and then you go to window two to collect your food, and they're open twenty-four hours.

你开车进来,沿着箭头指示,直到第一个窗口停下,点单,付账,再开到第二个窗口领取食物,他们是二十四小时营业的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选