Dictionary entry
twenty-four hours
地球自转一周的时间，即一天
the period of time for Earth to complete one rotation on its axis, equivalent to one day
- 1.
time for Earth to make a complete rotation on its axis
In use
The flight from New York to Sydney takes about twenty-four hours.
She has to stay awake for twenty-four hours to finish the project.
A day on Mars is roughly twenty-four hours and thirty-seven minutes long.
for twenty-four hours
表示持续时长。
The patient must be monitored for twenty-four hours.
患者必须被监测二十四小时。
within twenty-four hours
表示期限。
You must submit the report within twenty-four hours.
你必须在二十四小时内提交报告。
every twenty-four hours
表示频率。
Take one pill every twenty-four hours.
每二十四小时服一粒药。
twenty-four hours a day
表示全天。
The store is open twenty-four hours a day.
这家店一天二十四小时营业。
Common mistakes
I will finish it in a twenty-four hours.I will finish it in twenty-four hours.
中文学习者误将'twenty-four hours'当作可数单数名词，加上了不定冠词'a'。实际上'twenty-four hours'是复数形式，不能与不定冠词连用。正确的表达不加'a'。
after twenty-four hours delayafter twenty-four hours' delay
中文学习者常遗漏所有格符号，在表示时间段的复数名词后加's时应使用撇号。正确的形式是'twenty-four hours''（加撇号）表示所有格。
Connections
Dictionary facts from ECDICT, WORDNET.